perplexed
adj. B2 Upper Intermediate US //pɝˈpɫɛkst// UK //pəplˈɛkst// per·plexed
adj. confused because something is difficult to understand or explain. You feel this way when you cannot find a clear answer to a problem.
adj. completely baffled or puzzled by something complex or unaccountable. Often used predicatively after linking verbs like 'feel', 'look', or 'remain'.
She had a perplexed look on her face.
The scientists were perplexed by the sudden change in the data, as it contradicted all their previous findings.
Even the most experienced detectives remained perplexed by the suspect's lack of a clear motive, given that he had no prior connection to the victim.
Usage
Often followed by the prepositions 'by' or 'at'.