Vex (verb)

1. To bring trouble, disturbance, or annoyance to; to distress; to irritate.
2. To confuse or perplex.

Origin:

Middle english vexen, from old english wexan; akin to old high german wehsen to hurt, latin vis force.

Examples:

1. The constant noise of the construction outside my window vexes me.
2. His careless attitude vexes me.
3. The difficult math problem vexed the students.
4. The question vexed him, he could not figure out the answer.
5. The decision vexed her, she could not decide what to do.