Something which is confusing or enigmatic
Puzzling
There's a _____ lack of evidence in the case.
puzzling
Something from outer space
Extraterrestrial
Scientists have not ruled out the possibility of _________ life
extraterrestrial
Something which is unusual or peculiar
Odd
That's ___ that she didn't go directly home after work
odd
Of unknown cause
Unexplained
The disappearance of that girl is still _______
unexplained
Something which is unfamiliar and from another planet
alien
An _____ life form would be very exciting for scientists
alien
Something unexpected and surprising
strange
One of the pastries had a ______ shape
strange
Something confidential
A secret
Do you promise not to tell anybody this ____?
secret
Difficult or impossible to understand, explain, or identify.
Mysterious
David went outside to investigate the ________ scream
mysterious
