baffle
The financial markets can be baffling.
The book features a detective who can penetrate the most baffling mysteries.
Crash investigators are focusing on the baffling loss of the aircraft's tail.

SMART Vocabulary: related words and phrases

Confusion, confusing and feeling confused
addled
all of a doodahidiom
all over the placeidiom
alphabet soup
at seaidiom
discombobulation
disordered
disorganization
disorganized
disorientating
muddle something up
muddle-headed
muddled
mush
muzzily
unaccountable
unaccountably
unexplainable
unexplained
unsearchable