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moody

If you're in a bad mood, especially when you were in a pretty good mood this morning, you can say you're moody. A moody person's emotions change unpredictably and often.

Someone with erratic moods is moody — you could also call them temperamental or changeable. If you describe a painting or a piece of music as moody, you probably mean that it has a dark, gloomy nature. A moody play, for example, might be a little depressing, or at least melancholy. Moody, from the Old English modig, began by meaning "arrogant or proud," and around the late sixteenth century became "subject to gloomy spells."

Definitions of moody
  1. adjective
    subject to sharply varying moods
    synonyms: temperamental
    emotional
    of more than usual emotion
  2. adjective
    showing a brooding ill humor
    “he sat in moody silence”
    synonyms: dark, dour, glowering, glum, morose, saturnine, sour, sullen
    ill-natured
    having an irritable and unpleasant disposition
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