- 1(usually disapproving) having a tendency to become angry, excited, or upset easily, and to behave in an unreasonable way You never know what to expect with her. She's so temperamental. (figurative) The printer's being temperamental this morning. He's a temperamental player (= he plays well or badly according to his mood).
- 2connected with someone's nature and personality They are firm friends in spite of temperamental differences.
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NAmE//ˌtɛmprəˈmɛntl̩i//, NAmE//ˌtɛmpərˈmɛntl̩i//adverb I'm temperamentally unsuited to this job.