tem ‧ pe ‧ ra ‧ men ‧ tal /ˌtemp ə rəˈmentl◂/ BrE AmE adjective
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