- preposterous
- adj1. unreasonable, irrational, illogical, meaningless, senseless; incongruous, inconsistent, unconnected, groundless; high-flown, extravagant, extreme, outrageous, excessive, overdone, exaggerated, hyperbolized; incredible, unbelievable, astonishing; unthinkable, out of the question, impossible.2. foolish, absurd, inane, fatuous, nonsensical, Inf. damfool, Inf. damfoolish, tomfoolish, Scot, and North Eng. glaikit, Sl. cockeyed; stupid, unintelligent, mindless, fatuitous, brainless; poppycockish, Sl. cock-amamie, amphigoric; ridiculous, derisible, risible, laughable, ludicrous, Sl. for the birds; comical, funny, farcical, humorous, droll; asinine, anserine, idiotic, Inf. moronic, imbecilic; crazy, crazed, Sl. kooky, Scot. doiled, mad, wild, insane, demented, crackbrained, Inf. nutty; All Sl. balmy, dippy, batty, cuckoo, buggy, screwy, wacky, goofy, loony.
A Note on the Style of the synonym finder. 2014.