Aggravation (noun)

1. The act or process of making something worse.
2. The state or quality of being worse.
3. Something that makes something worse.
4. Annoyance or irritation.

Origin:

Middle english, from latin aggravation-, aggravatio, from aggravare to make heavier, from ad- + gravare to make heavy.

Examples:

1. He was already angry, and the delay was an aggravation to him.
2. The added traffic was an aggravation to the already congested road.
3. The long wait was an aggravation to the already frustrated customers.
4. The bad weather was an aggravation to the already difficult situation.
5. The noise from the construction was an aggravation to the peaceful neighborhood.