Definition for Groundless:

• Without foundation; without reason; as, groundless fears.

Synonyms for Groundless:

• adj.

  •baseless (adjective)
  • uncorroborated,
  • ungrounded,
  • Foundationless,
  • unsupported,
  • unconfirmed.
  •nonexistent (adjective)
  • hypothetical.
  •unfounded (adjective)
  • unproven.
  •unwarranted (adjective)
  • unjustifiable,
  • unwarrantable,
  • unwarranted.
  •without reason, justification (adjective)
  • chimerical,
  • bottomless,
  • unauthorized,
  • unjustified,
  • uncalled-for,
  • empty,
  • unwarranted,
  • Foundationless,
  • unfounded,
  • illogical,
  • baseless,
  • unprovoked,
  • imaginary,
  • illusory,
  • false,
  • unsupported,
  • gratuitous,
  • flimsy,
  • idle,
  • causeless.

• n.

  •
  • allegedly,
  • doubtful,
  • alleged,
  • seemingly,
  • anecdotal,
  • apparently,
  • supposed,
  • speculative.
  •
  • bottomless.
  •causeless (noun)
  • illogical.
  •groundless (noun)
  • unfounded,
  • unwarranted,
  • unsupported,
  • idle,
  • baseless.

• Other synonyms:

  •
  • superstitious,
  • bottomless.
  •irrational
  • illogical.
  •unproven
  • unverified.
  •unwanted
  • needless.
  •Other relevant words:
  • fantastic,
  • invalid,
  • illogical,
  • unproved,
  • flimsy,
  • chimerical,
  • illusory,
  • unauthorized,
  • irrational,
  • unendurable,
  • erroneous,
  • tenuous,
  • without basis,
  • undetermined,
  • unconfirmed,
  • indecisive,
  • untamed,
  • heterodox,
  • bottomless,
  • bogus,
  • empty,
  • vain,
  • supposed,
  • risky,
  • unsolicited,
  • uncertified,
  • ill-founded,
  • heedless,
  • flawed,
  • tempestuous,
  • raging,
  • Unsustained,
  • inexcusable,
  • jesuitic,
  • inequitable,
  • inconsiderate,
  • inconsequent,
  • Unreasoned,
  • sham,
  • wanton,
  • unused,
  • inconclusive,
  • godforsaken,
  • unlooked-for,
  • unsupportable,
  • needless,
  • inconsequential,
  • uncorroborated,
  • specious,
  • casuistic,
  • superstitious,
  • unfixed,
  • alleged,
  • seemingly,
  • sophistic,
  • not following,
  • implausible,
  • untried,
  • Unascertained,
  • Absonous,
  • unreal,
  • unsubstantiated,
  • unsustainable,
  • causeless,
  • insupportable,
  • fallacious,
  • uncivilized,
  • savage,
  • dotty,
  • unrequested,
  • furious,
  • misleading,
  • hypothetical,
  • hypocritical,
  • angry,
  • deceptive,
  • undemonstrated,
  • gratuitous,
  • suppositional,
  • doubtful,
  • unsettled,
  • unattested,
  • unsound,
  • unestablished,
  • unjustifiable,
  • uncivilised,
  • captious,
  • unruly,
  • unscientific,
  • light,
  • unwelcome,
  • wilful,
  • barbaric,
  • unproven,
  • undue,
  • non sequitur,
  • anecdotal,
  • unverified,
  • motiveless,
  • strapless,
  • apocryphal,
  • weak,
  • apparently,
  • hazardous,
  • fallible,
  • uncalled-for,
  • unmaintainable,
  • unauthenticated,
  • wild,
  • violent,
  • faulty,
  • speculative,
  • nonexistent,
  • Foundationless,
  • insubstantial,
  • untested,
  • unreasonable,
  • out of work,
  • ungrounded,
  • nonvalid,
  • imaginary,
  • heretical,
  • foolish,
  • unprovoked,
  • incorrect,
  • unjustified,
  • Absonant,
  • false,
  • crazy,
  • untrue,
  • inconsistent,
  • barbarian,
  • waste,
  • loose,
  • defective,
  • absurd,
  • illogic,
  • reckless,
  • unsubstantial,
  • allegedly,
  • untenable,
  • gaga,
  • sophistical,
  • ridiculous,
  • jobless,
  • unwarrantable,
  • indefensible,
  • dead.

Antonyms for Groundless:

• adj.

  • without reason, justification
    real, warranted, reasonable, right, genuine, called-for, correct, Grounded, substantiated, proven, justified.
  • Other antonyms:
    confirmed, wise, validated, true, genuine, substantiated, verified, sound, actual, sure, informed, sensible, sane, certified, well-grounded, certain, hard, credible, corroborated, plausible, real, clear.