The word "moody" is an adjective that describes a person's emotional state or behavior as being changeable, unpredictable and often influenced by their mood. A moody person may experience sudden shifts in their feelings, from happiness to sadness, anger to calmness, without any apparent reason. They can also be irritable or withdrawn, making it difficult for others to predict how they will behave at any given time. The term "moody" is often used colloquially to describe a person's mood swings or emotional outbursts that may seem exaggerated or unjustified.