Longman Dictionary of Contemporary English homepage

temperamental

 adjective
     
tem‧pe‧ra‧men‧tal
1 likely to suddenly become upset, excited, or angry - used to show disapproval:
Preston is particularly good at handling temperamental people.
2 a machine, system etc that is temperamental does not always work properly:
Sorry if the heater's a bit temperamental.
3 relating to the emotional part of someone's character:
serious temperamental differences between the couple
—temperamentally adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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