enigma
semicryptic
inenubilable
mystery
oddment
mutant
some
anomaly
unexpected
head-scratcher
boggler
unearthly
freak
some something or other
enigmatical
ostrobogulous
weirdie
weirdling
mind-boggler
curiously
gnomic
queer as a clockwork orange
stuff
oojah
enigmatic
astounder
freaky
arbit
quizzical
spectacle
milk-and-water
fremd
semimystical
odd fish
dark
wonder
normal for Norfolk
cat in the sack
fluffer
unicorn
freaky-deaky
quaint
bleeper
mystic
dilly
exotic
oddity
curio
hinky
catch
new
doobry
barmy
weird
freakish
eccentrically
mysterize
unusual
bit of fluff
runish
unconventional
makeshifty
apparition
sensationality
creep
riddle wrapped up in an enigma
old shoe
dipshit
question mark
outlandish
funny
queer
eye-opener
boner-killer
anyone's guess
thingamabob
semimagical
querulent
spookish
unintelligibility
peculiarly
inapplicability
mystifier
antrin
turn up for the book
vagary
mysteriously
enigmalike
unwonted
something or other
unaccustomed
exotica
zonky
as-yet-unknown
seld
mysterioso
way-out