absurd
asinine
cockamamie
cockamamy
cockeyed
derisory
fatuous
fond
goofy
harebrained
idiotic
ill-conceived
inane
insane
laughable
ludicrous
mad
mindless
misguided
nonsensical
preposterous
rattle-brained
rattle-pated
ridiculous
sappy
scatter-brained
scatty
silly
stupid
unwise
vacuous
wacky
whacky
zany
Pickwickian
airy
apish
arch
batty
befooled
beguiled
bemused
besotted
beyond belief
bizarre
blockheaded
boneheaded
brainless
brash
buffoonish
catchpenny
confused
contemptible
crazy
credulous
cuckoo
daffy
daft
dazed
demented
despicable
devilish
dim
dim-witted
dippy
dizzy
dopey
doting
dotty
dull-witted
dumb
elfish
elvish
empty
empty-headed
erratic
extravagant
fantastic
reckless
romantic
unhappy
weak
wicked
ghoulish
bright
intelligent
quick-witted
sane
smart
wise