Definitions

1. noun

a state of being puzzled or perplexed, especially by something complicated or difficult to understand

“The student’s perplexity was evident on her face as she struggled to solve the math problem.”

2. noun

a measure of how well a statistical model fits the data being analyzed

“The researcher calculated the perplexity of the language model to evaluate its performance.”

3. verb

to perplex or puzzle someone, especially by something complicated or difficult to understand

“The complex instructions perplexed the customer, who couldn’t figure out how to use the product.”