资料来源 : pyDict

喜怒无常;闷闷不乐

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Moodiness \Mood"i*ness\, n.
   The quality or state of being moody; specifically, liability
   to strange or violent moods.

资料来源 : WordNet®

moodiness
     n 1: a sullen gloomy feeling
     2: having temperamental and changeable moods