- adj1. illogical, unreasonable, without rhyme or reason, void of reason, unreasoning; unwise, unsound, injudicous, impolitic, imprudent; senseless, irrational, insensible, insensate; unintelligent, unthinking, lackwitted; thoughtless, witless, mindless, brainless, empty-headed; asinine, absurd, ludicrous, preposterous, ridiculous, nonsensical; insane, mad, crazy, lunatic, Sl. screwball, Sl. screwy, Sl. nutty, Sl. goofy, Sl. wacky.2. obtuse, dull, stolid, bovine, slow-witted, dull-witted, dim-witted, thick-witted.
A Note on the Style of the synonym finder. 2014.