per ‧ plex /pəˈpleks $ pər-/ BrE AmE verb [transitive]
[ Date: 1500-1600 ; Origin: perplex 'perplexed' (14-17 centuries) , from Latin perplexus , from plexus 'twisted together' ]
if something perplexes you, it makes you feel confused and worried because it is difficult to understand SYN puzzle :
Shea’s symptoms perplexed the doctors.
—perplexing adjective :
a perplexing problem