perplexity (n.)

c. 1300, "bewilderment," from Old French perplexite "confusion, perplexity," from Late Latin perplexitatem (nominative perplexitas), from Latin perplexus "confused, involved, interwoven," from per- "completely" + plexus "entangled," past participle of plectere "to twine" (from suffixed form of PIE root *plek- "to plait"). From 1590s as "something that causes perplexity."

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