"Cranky" is an adjective used to describe someone who is irritable or easily annoyed. People who are cranky may express their frustration through short responses, frowns, or complaints. This mood can be triggered by various factors, such as lack of sleep, stress, or hunger. In addition to describing a person's mood, "cranky" can also refer to objects that are difficult to operate or malfunctioning. For example, a cranky old car might make strange noises or have trouble starting. In both contexts, the term conveys a sense of discomfort or dissatisfaction.