astounding
dumbfounding
dumfounding
fabulous
improbable
marvellous
marvelous
tall
undreamed
undreamed of
undreamt
undreamt of
unimagined
a bit thick
a bit thin
absurd
amazing
antic
appalling
astonishing
awe-inspiring
awesome
beguiling
bewildering
beyond belief
bizarre
cockamamie
conspicuous
crazy
doubtable
doubtful
dubious
dubitable
egregious
enigmatic
exceptional
extraordinary
extravagant
fanciful
fantastic
fascinating
fictitious
flimsy
foolish
formidable
grotesque
hard of belief
hard to believe
hardly possible
high-flown
humongous
implausible
impossible
incomprehensible
inconceivable
laughable
ludicrous
marked
credibility
credible
creed
incredibility
incredibly
astonish
sheer
unexpected
edible
inedible