perplexity

noun

Etymology: From Middle English perplexite, borrowed from Middle French perplexité or post-classical Latin perplexitās, from perplexus (“entangled”). By surface analysis, perplex + -ity.

1. The state or quality of being perplexed.
2. Something that perplexes.

   “The Emperor, who was by then a focus of unresolvable perplexities, stood providing a strongly contrary appearance.”

3. A measure of how well a probability distribution or model predicts a sample.