Crank (irritable) refers to a state of being easily annoyed or angered. This mood can be triggered by various factors, including stress, lack of sleep, or external irritants. People who are cranky may exhibit short tempers, impatience, and a general sense of dissatisfaction. In psychology, irritability is often linked to emotional regulation difficulties. It can affect relationships and daily functioning. Understanding the causes of crankiness, such as stress or fatigue, can help individuals manage their emotions better and improve their interactions with others.