unfounded

Synonyms

baseless, foundationless, groundless, invalid, nonvalid, unreasonable, unsubstantiated, unsupported, unwarranted;

Antonyms

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

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, sound;

Related Words

illogical, irrational, nonlogical, unconscionable, unsound;

fallacious, false, misled, wrong;

gratuitous, uncalled-for, unnecessary;

flimsy, implausible, misleading, specious, unconvincing, untenable, weak;

ill-advised, unreasoned;

inconsistent;

absurd, asinine, brainless, crackpot, crazy, fatuous, foolish, half-witted, harebrained, meaningless, nonsensical, preposterous, senseless, silly, simpleminded, stupid, unwise;

insane, lunatic, mad, nutty, wacky (also whacky);