Synonyms for preposterous
See preposterous in Webster's New World Roget's A-Z Thesaurus II
adjective
So senseless as to be laughable:
absurd, foolish, harebrained, idiotic, imbecilic, insane, lunatic, mad, moronic, nonsensical, silly, softheaded, tomfool, unearthly, zany. (Informal) cockeyed, crazy, loony, loopy. (Slang) balmy2, dippy, dopey, jerky, sappy, wacky. See ability, knowledgeBeyond all reason:
obscene, outrageous, ridiculous, shocking, unconscionable, unreasonable. Idioms: out of bounds, out of sight. See usual
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