Entry Word: groundless

Function: adjective

Meaning: having no basis in reason or fact <please stop making groundless accusations against the teachers you dislike> <fears of a strike proved groundless>

Synonyms invalid, nonvalid, unfounded, ungrounded, unreasonable, unsubstantiated, unsupported, unwarranted

Related Words illogical, irrational, nonlogical, unconscionable, unsound; fallacious, false, misled, wrong; gratuitous, uncalled-for, unnecessary; flimsy, implausible, misleading, specious, unconvincing, unsatisfying, untenable, weak; ill-advised, unreasoned; inconsistent; absurd, asinine, foolish, meaningless, nonsensical, preposterous, senseless, silly; insane, nutty, mad, wacky

Near Antonyms certified, validated, verified; confirmed, corroborated; informed, logical, rational; commonsense, sane, sensible, sober, wise; actual, genuine, real, true; certain, sure; clear, cogent, compelling, convincing, credible, persuasive, plausible, satisfying, solid

Antonyms good, hard, just, justified, reasonable, reasoned, substantiated, valid, well-founded