The story
- Latin · derived fromperplexitās
- Middle French · derived fromperplexité
- Middle English · inherited fromperplexite
- English todayperplexity
From Middle English perplexite, borrowed from Middle French perplexité or post-classical Latin perplexitās, from perplexus (“entangled”). By surface analysis, perplex + -ity.
Etymology from Wiktionary, CC BY-SA 4.0.