Moody/ˈmuːdi/ Definition 1 of 3Pro Tip 1/3Emotional Tone Use 'moody' to describe someone's unpredictable emotional state, not their overall personality. He's been really moody since he lost his job. Pro Tip 2/3Negative Connotation 'Moody' often implies a negative view of someone's changing emotions. My boss is moody and hard to please. Pro Tip 3/3Not Always Bad Though 'moody' is seen negatively, it can just mean someone is reflective or deep in thought. She's not upset, just moody while she's painting.