To perplex is defined as to confuse or complicate.(verb)
An example of perplex is to challenge a class with a very difficult question.
See perplex in Webster's New World College Dictionary
Origin: < ME perplex, perplexed < MFr perplexe < L perplexus, entangled, confused, involved < per, through + plexus, pp. of plectere, to twist, plait: see ply
See perplex in American Heritage Dictionary 4
transitive verb per·plexed, per·plex·ing, per·plex·es
Origin: Back-formation from Middle English perplexed, puzzled; see perplexed.
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