Synonyms for Sudden:

• adj.

  •abrupt (adjective)
  • most unanticipated,
  • un ceremonious,
  • most precipitate,
  • more unanticipated,
  • un-anticipated,
  • un-ceremonious,
  • un anticipated.
  •acute (adjective)
  • more serious,
  • over-whelming,
  • powerful,
  • over whelming,
  • more racking,
  • over powering,
  • more shooting,
  • over-powering,
  • more acute,
  • severe,
  • most shooting,
  • most racking.
  •all (adjective)
  • sudden.
  •dramatic (adjective)
  • suspenseful,
  • Theatric,
  • Histrionical,
  • tragicomic,
  • farcical,
  • expressive.
  •fleeting (adjective)
  • shortlived,
  • flash in pan,
  • evanescent,
  • impermanent,
  • flash pan,
  • flash the pan,
  • fugacious,
  • short lived.
  •haphazard (adjective)
  • in-discriminate,
  • flukest,
  • more unmethodical,
  • un systematic,
  • de-signless,
  • un-organized,
  • un concerned,
  • un conscious,
  • all over map,
  • in discriminate,
  • un organized,
  • un thinking,
  • un coordinated,
  • un-methodical,
  • helter skelter,
  • un-premeditated,
  • de signless,
  • dis organized,
  • unsystematic,
  • un methodical,
  • dis-organized,
  • devil may care,
  • most unmethodical,
  • dis-orderly,
  • more designless,
  • dis orderly,
  • un-concerned,
  • willynilly,
  • most designless,
  • un-thinking,
  • fluker,
  • helterskelter,
  • Willy nilly,
  • un-systematic,
  • un-coordinated,
  • unconscious,
  • un premeditated,
  • un considered,
  • un-considered,
  • un-conscious.
  •hasty (adjective)
  • harefooted,
  • slambang,
  • chop-chop.
  •headlong (adjective)
  • headlong.
  •histrionical (adjective)
  • thest,
  • THER.
  •hurried (adjective)
  • most subitaneous,
  • hectic,
  • Subitaneous,
  • more subitaneous.
  •impatient (adjective)
  • most appetent,
  • most chafing,
  • more unindulgent,
  • most straining,
  • more chafing,
  • more straining,
  • unindulgent,
  • on pins needles,
  • racing one motor,
  • hot tempered,
  • racing ones motor,
  • most unindulgent,
  • in tolerant,
  • more appetent,
  • un indulgent,
  • racing motor,
  • quicktempered,
  • racing one's motor,
  • ripe,
  • in-tolerant,
  • thirsty,
  • quick tempered,
  • un-indulgent.
  •impetuous (adjective)
  • most unreflecting,
  • spur of the moment,
  • un-restrained,
  • un-planned,
  • un reflecting,
  • more unreflecting,
  • going off deep end,
  • un bridled,
  • spur-of-the-moment,
  • un-bridled,
  • going deep end,
  • unreflecting,
  • un-reflecting,
  • un planned.
  •impulsive (adjective)
  • ADLIB,
  • gone off deep end,
  • ad lib,
  • unprompted,
  • hot and cold,
  • hot-and-cold,
  • Unmeditated.
  •quick (adjective)
  • Expeditive,
  • post haste,
  • ex press,
  • lead out,
  • more expeditive,
  • post-haste,
  • quickest,
  • instantaneous,
  • most expeditive,
  • ex-press,
  • quick.
  •snappy (adjective)
  • most on-the-spot,
  • more on the spot,
  • more on-the-spot,
  • most on the spot.
  •sudden (adjective)
  • precipitous,
  • immediate.
  •surprising (adjective)
  • shocking,
  • from left field,
  • extra ordinary,
  • startling,
  • astounding,
  • astonishing.
  •swift (adjective)
  • more fleet-footed,
  • most doublequick,
  • more double quick,
  • more alacritous,
  • most double-quick,
  • most speedball,
  • shaking leg,
  • most fleet footed,
  • more doublequick,
  • more fleet footed,
  • most screaming,
  • more fleetfooted,
  • most cracking,
  • in nothing flat,
  • most double quick,
  • most fleet-footed,
  • fleet-footed,
  • more double-quick,
  • more barrelling,
  • doublequick,
  • most alacritous,
  • more supersonic,
  • more speedball,
  • fleetfooted,
  • more screaming,
  • fleet footed,
  • most supersonic,
  • most fleetfooted,
  • most barrelling,
  • double quick,
  • more cracking,
  • super-sonic,
  • super sonic.
  •unexpected (adjective)
  • most eyeopening,
  • un expected,
  • more eye-opening,
  • most eye opening,
  • most unlookedfor,
  • most unlooked-for,
  • most unlooked for,
  • more unlookedfor,
  • eyeopening,
  • most payback,
  • most eye-opening,
  • more eye opening,
  • un-heralded,
  • not cards,
  • unlookedfor,
  • un heralded,
  • more eyeopening,
  • eye opening,
  • more unlooked for,
  • not the cards,
  • not in cards,
  • un-expected,
  • more unlooked-for,
  • more payback.
  •unforeseen (adjective)
  • un-foreseen,
  • un calculated,
  • more uncalculated,
  • more surprise,
  • most uncalculated,
  • sur-prise,
  • most surprise,
  • un foreseen,
  • un-calculated,
  • sur prise.

• adv.

  •short (adverb)
  • without delay.
  •suddenly (adverb)
  • all once,
  • on spur moment,
  • all sudden,
  • all of sudden,
  • all a sudden.
  •unawares (adverb)
  • unconsciously.

• adv

  •short (adverb)
  • without hesitation,
  • by surprise.
  •suddenly (adverb)
  • on spur of moment,
  • asudden.
  •unawares (adverb)
  • unready,
  • off guard,
  • by mistake,
  • by accident,
  • unknowingly,
  • ignorantly.

• n.

  •
  • phenomenal,
  • sensational,
  • extraordinary,
  • amazing,
  • staggering,
  • earth-shattering,
  • remarkable.
  •
  • fast,
  • precipitate,
  • surprise.
  •explosive (noun)
  • explosive.
  •fulminant (noun)
  • fulminant.
  •sudden (noun)
  • unforeseen.

• Other synonyms:

  •brilliant
  • meteoric.
  •flying
  • swift.
  •Other relevant words:
  • emergent,
  • unheralded,
  • unthinking,
  • subversion,
  • chance,
  • brisk,
  • banner,
  • change of state,
  • smack,
  • coincidence,
  • sharply,
  • precipitancy,
  • numbing,
  • snap,
  • dash,
  • instinctive,
  • touchy,
  • improbable,
  • full,
  • waspish,
  • convulsive,
  • quantum jump,
  • peppery,
  • jerking,
  • impressive,
  • hotheaded,
  • impulsively,
  • phase change,
  • tempt,
  • actuate,
  • contravene,
  • accelerated,
  • wealth,
  • russias,
  • fright,
  • disturb,
  • cheat,
  • fiery,
  • slope,
  • delude,
  • summary,
  • Speeded,
  • express,
  • cutting,
  • in haste,
  • aback,
  • fortuitous,
  • enliven,
  • stupefying,
  • nimble,
  • injudicious,
  • involuntary,
  • hurriedly,
  • stimulate,
  • graphic,
  • quickly,
  • go against,
  • provoke,
  • plop,
  • snappy,
  • piercing,
  • striking,
  • foolish,
  • intense,
  • streamer,
  • impromptu,
  • unhesitating,
  • out-of-the-way,
  • unplanned,
  • unaware,
  • prey,
  • shortly,
  • lightning,
  • rapidly,
  • clean sweep,
  • brief,
  • surprisingly,
  • overnight,
  • extemporaneous,
  • all of a sudden,
  • improvisation,
  • absolute,
  • violent,
  • timely,
  • rapid,
  • break through,
  • prompt,
  • sharp,
  • have,
  • revolution,
  • radical,
  • abet,
  • unanticipatedly,
  • momentary,
  • flag,
  • undivined,
  • unannounced,
  • instant,
  • techy,
  • near,
  • reckless,
  • complete,
  • stabbing,
  • abruptness,
  • unpremeditated,
  • expeditious,
  • euthanasia,
  • pettish,
  • exceptional,
  • arouse,
  • steepness,
  • stir,
  • haste,
  • penetrating,
  • destruction,
  • inspiration,
  • triggered,
  • betray,
  • unpredictable,
  • momentarily,
  • dead,
  • deceive,
  • extreme,
  • rushing,
  • induce,
  • mind-blowing,
  • ensign,
  • suddenness,
  • disease,
  • impulse,
  • wake,
  • choppy,
  • shock,
  • quickened,
  • steep,
  • slap,
  • unusual,
  • petulant,
  • tetchy,
  • excruciating,
  • impetuously,
  • untimely end,
  • Subito,
  • breakneck,
  • major,
  • bang,
  • feverishly,
  • casualty,
  • pennant,
  • absolutely,
  • shrewish,
  • effective,
  • breathless,
  • overhasty,
  • lively,
  • unexpectedly,
  • unpredicted,
  • entice,
  • whirlwind,
  • jut out,
  • offhand,
  • accident,
  • offend,
  • quantum leap,
  • high-speed,
  • devil-may-care,
  • abruptly,
  • breathtaking,
  • utterly,
  • unwonted,
  • snappish,
  • noticeable,
  • imprudent,
  • impel,
  • hot,
  • spontaneous,
  • panting,
  • short,
  • out of the blue,
  • perfect,
  • fierce,
  • paroxysmal,
  • rashly,
  • rude,
  • perpendicular,
  • spurt,
  • swiftly,
  • very,
  • choleric,
  • loss,
  • passionate,
  • killing,
  • simulate,
  • abundance,
  • electrifying,
  • precipitance,
  • unforeseeable,
  • vertical,
  • precipitously,
  • pennon,
  • excite,
  • forthwith,
  • incite,
  • pop,
  • instantly,
  • incautious,
  • wild,
  • speedy,
  • death blow,
  • fortune,
  • suffocation,
  • huffy,
  • asphyxia,
  • spasmodic,
  • vivid,
  • unprepared for,
  • alarm,
  • foolhardy,
  • jerky,
  • plump,
  • unconsidered,
  • emotional,
  • snapper,
  • shooting,
  • chimney,
  • flash,
  • discontinuous,
  • unfore,
  • Unguessed,
  • perfunctory,
  • irritate,
  • hastily,
  • exquisite,
  • considerable,
  • poignant,
  • testy,
  • automatic,
  • rash,
  • sniff,
  • spastic,
  • start,
  • warm,
  • plunk,
  • mind-boggling,
  • reflex,
  • violent death,
  • wonder,
  • blow,
  • without warning,
  • marked,
  • radical change,
  • madcap,
  • all of,
  • drastic,
  • thunderclap,
  • stir up,
  • fleet,
  • NATURAL DEATH,
  • thoughtless,
  • feign,
  • get,
  • sheer,
  • jolt,
  • Spasmodical,
  • of a sudden,
  • pretend,
  • perfectly,
  • curt,
  • all at once,
  • Bouleversement,
  • fall prostrate.

Paraphrases for Sudden:

• Equivalence

  • Adjective
    abrupt.

• Reverse Entailment

  • Adjective
    sudden-onset.

• Independent

  • Adjective
    brusque, Precipitated, unplanned, unintended, hasty, spontaneous, immediate, spectacular, acute, unpredictable, precipitate, stunning.
  • Verb, past participle
    sustained, Endured, Suffered, Incurred, Exerted.

• Other Related

  • Adjective
    precipitous, surprising, unforeseen, unannounced, unanticipated, short-notice, sharp, dramatic, surprise, brutal, drastic, unexpected, steep, untimely, brutish, violent.
  • Proper noun, singular
    surprise, unexpected.
  • Noun, singular or mass
    surprise.

Antonyms for Sudden:

• adj.

  • all
    gradual.
  • unexpected; happening quickly
    leisurely, sluggish, slow, lazy, delayed.
  • Other antonyms:
    gradatory, unsurprising, graduated, piecemeal, predicted, expected, gradational, anticipated, stepwise, in small stages, foreseen.

• Other antonyms:

  • n.
    dull, flat, natural, nonexplosive, unsudden.