Synonyms for Underground:

• adj.

  •below the surface (adjective)
  • in the recesses,
  • sunken,
  • below ground,
  • covered,
  • buried.
  •clandestine (adjective)
  • under hand,
  • hush hush,
  • more closet,
  • in holes and corners,
  • most under-the-counter,
  • more under-the-counter,
  • foxy,
  • most closet,
  • more under the counter,
  • most under the counter,
  • hushhush,
  • in holes corners,
  • under wraps,
  • under-hand,
  • on qt,
  • on quiet,
  • on the q t,
  • on q t.
  •deep (adjective)
  • downreaching,
  • fathomless,
  • subaqueous,
  • inmost.
  •hidden (adjective)
  • un-known,
  • Imperceivable,
  • most sequestered,
  • in-visible,
  • un disclosed,
  • masked,
  • more sequestered,
  • out view,
  • more eclipsed,
  • un-revealed,
  • dis-guised,
  • more shrouded,
  • in discernible,
  • most hermetical,
  • in-discernible,
  • un-disclosed,
  • un known,
  • un detected,
  • un exposed,
  • hermetic,
  • most eclipsed,
  • most unrevealed,
  • more imperceivable,
  • un revealed,
  • with held,
  • most shrouded,
  • with-held,
  • in visible,
  • more hermetical,
  • un-exposed,
  • most imperceivable,
  • un-detected,
  • withheld,
  • in dark,
  • more unrevealed,
  • dis guised.
  •secret (adjective)
  • enigmatical.
  •secret, subversive (adjective)
  • surreptitious.
  •subversive (adjective)
  • under mining,
  • most insurrectionary,
  • more overthrowing,
  • over throwing,
  • more perversive,
  • most perversive,
  • more undermining,
  • more insurrectionary,
  • over-throwing,
  • under-mining,
  • most overthrowing,
  • most undermining.
  •undercover (adjective)
  • stealth,
  • sub-rosa.

• adv.

  •all (adverb)
  • underground.

• n.

  •
  • obscure,
  • personal,
  • uncertain,
  • unknown,
  • anonymous,
  • strange.
  •
  • in strict confidence,
  • subterranean,
  • surface,
  • mysterious,
  • confidential.
  •
  • underneath,
  • lower,
  • below.
  •
  • depth.
  •black market (noun)
  • under ground,
  • underworld market,
  • illegitimate business,
  • black-market,
  • shady dealings,
  • undergrounds,
  • illegal sales,
  • underground market,
  • illicit business,
  • bootleg market,
  • gray market.
  •british (noun)
  • métro,
  • tube,
  • subway.
  •cloak-and-dagger (noun)
  • cloak-and-dagger.
  •covert (noun)
  • covert.
  •fifth column (noun)
  • collaborators of enemy,
  • saboteurs,
  • subversives,
  • saboteur.
  •group (noun)
  • resistance.
  •hugger mugger (noun)
  • hugger mugger.
  •hush-hush (noun)
  • hush-hush.
  •irregular (noun)
  • irregular.
  •metro (noun)
  • metro.
  •partisan (noun)
  • partisan.
  •partizan (noun)
  • partizan.
  •subsurface (noun)
  • subsurface.
  •subway (noun)
  • metros.
  •underground (noun)
  • guerilla.

• Other synonyms:

  •
  • nether,
  • non-committal,
  • closed-door,
  • confidentially,
  • conspiratorial,
  • classified,
  • inwardly,
  • underfloor,
  • Hypogean,
  • shady,
  • secretive,
  • close-mouthed,
  • Subterrestrial,
  • top-secret,
  • need-to-know,
  • underfoot,
  • underwater,
  • cagey,
  • guarded,
  • shadowy,
  • underlying,
  • secretly,
  • undersea,
  • surreptitiously,
  • backroom,
  • back-alley,
  • hypogeal,
  • Hypogeous.
  •
  • tight-lipped,
  • backstreet,
  • beneath,
  • privately,
  • train,
  • inner,
  • unidentified.
  •
  • sensitive,
  • closet,
  • privileged,
  • backstage.
  •
  • closed,
  • inside.
  •
  • intimate.
  •
  • under.
  •
  • front.
  •auxiliary
  • guerrilla.
  •belowground
  • belowground.
  •Other relevant words:
  • in a fog,
  • line,
  • dimly,
  • bush telegraph,
  • underground railroad,
  • blind,
  • understand,
  • under side,
  • elevated,
  • admitted,
  • immunity,
  • Ohmic Resistance,
  • conceal,
  • latent,
  • radical,
  • electrical resistance,
  • escape hatch,
  • railroad train,
  • Delitescent,
  • skulking,
  • constructive,
  • track,
  • local,
  • darkly,
  • mystic,
  • behind-the-scenes,
  • unpredictable,
  • special,
  • with bated breath,
  • trolley line,
  • conflict,
  • flier,
  • disapprobation,
  • back door,
  • impedance,
  • realize,
  • dissident,
  • resistant,
  • sly,
  • mysteriously,
  • under-the-table,
  • diversity,
  • Obfuscated,
  • disaccord,
  • resistivity,
  • close,
  • unconventional,
  • furtively,
  • cunningly,
  • casual,
  • muffled,
  • exemption,
  • terminus,
  • underworld,
  • contrast,
  • maquisard,
  • in secret,
  • embed,
  • competition,
  • rack railway,
  • tubing,
  • underground fighter,
  • incommunicado,
  • schismatical,
  • cog railway,
  • cable railway,
  • furtive,
  • tunnel,
  • opponent,
  • apprehend,
  • dis,
  • alienated,
  • resisters,
  • collaborator,
  • believe,
  • in the background,
  • lurking,
  • dissentient,
  • switchback,
  • fellow traveler,
  • unobtrusive,
  • freight,
  • duct,
  • occult,
  • underhand,
  • at odds,
  • secluded,
  • Perdu,
  • flyer,
  • alienation,
  • trunk,
  • maverick,
  • conceive,
  • Nonconcurrence,
  • security risk,
  • resistor,
  • resistance fighter,
  • thermionic valve,
  • freighter,
  • temporary,
  • implicit,
  • tram,
  • profound,
  • obscurely,
  • electric railway,
  • vacuum tube,
  • Sectary,
  • discern,
  • sneaking,
  • sidetrack,
  • resistive,
  • indirect,
  • contradiction,
  • Hypocaust,
  • behind the veil,
  • goods train,
  • avernus,
  • privy,
  • bury,
  • shuttle,
  • passenger train,
  • crooked,
  • lowered,
  • resting in peace,
  • agreement to disagree,
  • stealthily,
  • invisible,
  • nonconsent,
  • sectarian,
  • mystically,
  • revolutionary,
  • antagonism,
  • inferential,
  • roadbed,
  • antithesis,
  • difference,
  • quietly,
  • under the breath,
  • bolt-hole,
  • rattler,
  • streamliner,
  • express,
  • breakaway,
  • nether regions,
  • orcus,
  • learn,
  • assume,
  • basement,
  • hole-and-corner,
  • parliamentary,
  • in opposition,
  • illegal,
  • underhanded,
  • electric resistance,
  • feline,
  • in-ground,
  • dissatisfaction,
  • gloomily,
  • sotto voce,
  • side door,
  • thermionic tube,
  • conduit,
  • fifth columnist,
  • cog railroad,
  • by implication,
  • Hid,
  • disagreeing,
  • at variance with,
  • Eclipsed,
  • turnout,
  • choo-choo,
  • Slinky,
  • freight train,
  • disparity,
  • underpass,
  • partisans,
  • dissenting,
  • nonconforming,
  • inscrutable,
  • terminal,
  • submerged,
  • comprehend,
  • abstruse,
  • on the sly,
  • could,
  • shifty,
  • backstairs,
  • guerillas,
  • channel,
  • sunk,
  • tramline,
  • branch,
  • below-ground,
  • repudiation,
  • apostasy,
  • recusance,
  • funicular,
  • collaborationist,
  • secret exit,
  • opposition,
  • strangely,
  • antiestablishment,
  • CRYPTO,
  • underground route,
  • Interurban,
  • disapproval,
  • abnormal,
  • at odds with,
  • six feet under,
  • subway system,
  • enclose,
  • irregulars,
  • dissension,
  • truck bed,
  • on the qt,
  • behind the curtain,
  • monorail,
  • submarine,
  • feeder,
  • in hiding,
  • disagreement,
  • streetcar line,
  • expect,
  • opposing,
  • contrariety,
  • by stealth,
  • Fraternizer,
  • insurgents,
  • secret passage,
  • rail line,
  • under the rose,
  • cryptically,
  • Bushfighter,
  • in ambush,
  • unorthodox,
  • electric,
  • orphic,
  • Subterrene,
  • insurrectionists,
  • allusive,
  • partizans,
  • Slinking,
  • in the wings,
  • alternative,
  • Hell,
  • topsy-turvy,
  • in a cloud,
  • jumbled,
  • variance,
  • sneaky,
  • backdoor,
  • at variance,
  • rail,
  • inexplicable,
  • guerrillas,
  • street railway,
  • quiet,
  • elevated railway,
  • pipe,
  • perceive,
  • covertly,
  • closely,
  • settled,
  • recusant,
  • get,
  • rejection,
  • thermionic vacuum tube,
  • understood,
  • concealed,
  • mystical,
  • Express train,
  • back way,
  • trunk line,
  • murkily,
  • inclose,
  • hostility,
  • dissent,
  • stealthy,
  • in darkness,
  • limited,
  • not expressed,
  • enemy,
  • disorderly,
  • sneakily,
  • bushwhacker,
  • counter-culture,
  • private,
  • maquis,
  • rebel,
  • sequestered,
  • feeder line,
  • grapevine telegraph,
  • mine,
  • nonagreement,
  • freedom,
  • withdrawal,
  • in the shade,
  • hades,
  • nonconformist,
  • slyly,
  • in a corner,
  • at rest,
  • embankment,
  • unusual,
  • Obscured,
  • endurance,
  • rapid transit,
  • sea bottom,
  • secession,
  • Beclouded,
  • freedom fighters,
  • baggage train,
  • recusancy,
  • under cover,
  • recondite,
  • in a whisper,
  • situate,
  • in the dark,
  • revolutionaries,
  • privily,
  • differing,
  • unavowed,
  • enigmatically,
  • secluse,
  • trestle,
  • extremists,
  • nonconformity,
  • avant-garde,
  • grapevine,
  • experimental,
  • roadway,
  • huggermugger,
  • junction,
  • dissidence,
  • cellar,
  • unbowed,
  • siding,
  • clouded,
  • subterraneous,
  • electron tube,
  • seditionists,
  • beneath surface,
  • dissentience,
  • atypical,
  • undisclosed,
  • clandestinely.

Paraphrases for Underground:

• Equivalence

  • Adjective
    below-ground, metro, subterranean, subsurface.
  • Proper noun, singular
    metro, subterranean, subsurface.
  • Noun, singular or mass
    metro, subsurface.

• Forward Entailment

  • Adjective
    ground.
  • Proper noun, singular
    ground.
  • Noun, singular or mass
    ground.

• Independent

  • Adjective
    unreported, belowground, undeclared, sub-surface, covert, undocumented, groundwater, black, metropolitan, submerged, unofficial, confidential, under, parallel, informal, secretive.
  • Proper noun, singular
    commanders, chiefs, executives, chefs, heads, groundwater.
  • Noun, singular or mass
    stamina, belowground, underpass, hiding, underworld, groundwater.
  • Adverb
    clandestinely, under.

• Other Related

  • Adjective
    clandestine.
  • Proper noun, singular
    clandestine.

Antonyms for Underground:

• adj.

  • below the surface
    legal, aboveground, known, public, sky, ground, Condoned, authorized.
  • secret, subversive
    conservative.
  • Other antonyms:
    clear, aboveboard, acknowledged, patent, open, straightforward, unconcealed, obvious, avowed, undisguised, unrestricted, plain, unclassified, manifest, evident.

Hypernym for Underground:

• n.

  • group
    maquis.

Hyponym for Underground:

• n.

  • group
    revolutionary group.