temperamental

 
Pronunciation: /ˌtɛmp(ə)rəˈmɛnt(ə)l/

adjective

  • 1(of a person) liable to unreasonable changes of mood: a temperamental film star figurative a temperamental engine that had a way of conking out when put in gear
  • 2relating to a person’s temperament: they were firm friends in spite of temperamental differences

Derivatives

temperamentally

adverb