perplexes
per-plex-es
verb
Causes someone to feel completely confused, bewildered, or puzzled by something difficult.
"The intricate problem perplexes even seasoned mathematicians."
Thesaurus
Synonyms: puzzle, flummox, mystify, baffle, beat, get, vex, stick, dumbfound, pose, gravel, bewilder
Antonyms: simplify