Perplex (verb)

1. To confuse or puzzle someone.
2. To make someone unsure of what to do or think.

Origin:

Late latin perplexare to entangle, from latin per- thoroughly + plexus entwined, from past participle of plectere to braid.

Examples:

1. The math problem perplexed the student.
2. The new policy perplexed the employees.
3. His behavior perplexed his friends.
4. The instructions perplexed the users.
5. The situation perplexed the authorities.