absurd
beyond belief
bizarre
cockamamie
crazy
extravagant
fantastic
foolish
freakish
grotesque
high-flown
incredible
kinky
laughable
ludicrous
monstrous
nonsensical
odd
out-of-the-way
outlandish
outrageous
peculiar
poppycockish
preposterous
ridiculous
strange
ultra
unconventional
unusual
weird
wild