groundless Synonyms

baseless unfounded wild idle unsupported unwarranted unproved unverified ungrounded unprovoked wanton unwarrantable untrue unsupportable unsound unreasoned unreasonable undue unconfirmed unpardonable without justification without cause untested unsubstantiated unscientific unmeritorious uncorroborated unconvincing unattested strapless unproven unjustifiable untenable ill-founded unjustified uncaused uncalled-for toothless illogical absonous gratuitous foundationless flimsy false fallacious expletory erroneous empty causeless bottomless