foolish silly stupid absurd witless asinine brainless inane puerile idiotic ludicrous mindless nonsensical vacuous childish daft imbecilic preposterous senseless dense dull infantile moronic pointless balmy cockeyed crackpot crazy cuckoo daffy dippy dotty fool harebrained inept insane jerky kookie kooky laughable looney loony lunatic mad nutty ridiculous risible sappy screwball simpleminded tomfool unwise wacky whacky zany cretinous dumb gormless complacent imbecile insensate insipid meaningless unaware unintelligent irrational unreasonable illogical dopey doltish thickheaded imprudent goofy barmy dim bizarre simple foolhardy thick screwy cockamamie thoughtless fantastic batty dunderheaded giddy farcical obtuse damfool injudicious impractical glaikit boneheaded slow pinheaded loopy irresponsible outrageous scatterbrained flighty