Other forms: exasperated; exasperating; exasperates
To exasperate someone is to annoy him or her to the point of impatience, frustration and irritation, like when you exasperate a busy waiter by asking questions like "what are all the ingredients in the salad dressing?" and making him repeat the specials five times.
The verb exasperate comes from the Latin word exasperatus, which means “to roughen,” “irritate,” or “provoke.” To exasperate is to make something that is already bad even worse, like when sitting in traffic that is sure to make you late, you exasperate the person who is driving by bringing up an unpleasant topic, or the addition of twenty more students that exasperates the crowding in the cafeteria.