perplex
Concise Oxford English Dictionary © 2008 Oxford University Press:
perplex/pəˈpleks/
▶verb cause (someone) to feel baffled.
– derivatives
perplexed adjective,
perplexedly adverb,
perplexing adjective,
perplexingly adverb,
perplexity noun (pl. perplexities).
perplexed adjective,
perplexedly adverb,
perplexing adjective,
perplexingly adverb,
perplexity noun (pl. perplexities).
– origin C15: from the obs. adj. perplex ‘bewildered’, from L. perplexus ‘entangled’.
'perplex' also found in these Oxford entries:

