temperamental
adjective /ˌtemprəˈmentl/
  /ˌtemprəˈmentl/
 - (usually disapproving) tending 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).
 
Oxford Collocations Dictionaryverbs- be
 - become
 - get
 - …
 
- extremely
 - fairly
 - very
 - …
 
 - connected with somebody’s nature and personality
- They are firm friends in spite of temperamental differences.