moody
[ˈmudi]
adj.
喜怒无常的;
忧悒的;
（无缘无故）不高兴的;
脾气坏的;
adv.
喜怒无常地，情绪多变地;
n.
喜怒无常;
例句:
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This week we look at the Moody's downgrade.
来自THETIMES
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The boy is fourteen, often evasive and moody.
来自D. DeLillo
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Her husband had become withdrawn and moody.
她丈夫变得沉默寡言、喜怒无常。
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David's mother was unstable and moody.
戴维的妈妈情绪不稳定，心情也不好。
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My daughter is very difficult, uncommunicative and moody.
我女儿很难相处，不愿跟人交流，又非常情绪化。
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Several readers of the Moody's report offered praise.
来自WSJ