— absurd
— asinine
— cockamamie
— cockamamy
— cockeyed
— derisory
— fallacy
— false
— fatuous
— filch
— flag
— flak
— flash
— flashy
— fleck
— flesh
— fleshy
— flex
— flick
— flock
— flog
— fluke
— flush
— flux
— foliage
— folk
— folks
— fond
— goofy
— harebrained
— idiotic
— ill-advised
— ill-conceived
— impolitic
— imprudent
— inadvisable
— inane
— insane
— laughable
— ludicrous
— mad
— mindless
— misbegotten
— misguided
— nonsensical
— preposterous
— rattlebrained
— rattlepated
— ridic
— ridiculous
— sappy
— scatterbrained
— scatty
— silly
— stupid
— unadvisable
— unadvised
— unwise
— vacuous
— wacky
— whacky
— zany