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temperamental

Temperamental describes someone or something that is prone to wild swings of emotion or that does not behave or work reliably. (adjective)

  1. A car engine that istemperamental is one that doesn't start reliably or that starts only under certain conditions.
  2. A person who gets mad or happy easily and swings from one emotion to the other is an example of someone who istemperamental.

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See temperamental in Webster's New World College Dictionary

See temperamental in American Heritage Dictionary 4

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