Irritable (adjective)

1. Easily annoyed or made angry.
2. Tending to become angry easily.
3. Sensitive and easily made uncomfortable or sore.

Origin:

From late latin irritabilis, from irritare ("to irritate"). first recorded in english in the 1620s.

Examples:

1. He was feeling irritable and snapped at his coworkers for no reason.
2. She was irritable after working long hours and lacked sleep.
3. The constant noise was making him irritable and he asked for it to stop.
4. Due to her menstruation, she was feeling irritable and couldn't concentrate.
5. The long wait made the customers irritable and they started complaining.