Irritancy is a term used to describe something that is annoying or exasperating. It can be characterized by a lack of patience or tolerance, causing discomfort or agitation. There are several synonyms for irritancy, including annoyance, vexation, frustration, agitation, and provocation. These words suggest that something or someone is causing irritation, whether it be a situation, a person, or something else entirely. Other synonyms may include irritability, peevishness, acrimony, and animosity. The use of these synonyms can help to convey the level of irritation experienced, and can help to communicate the emotions that are being felt.