English

Adjective

even-tempered ‎(comparative more even-tempered, superlative most even-tempered)

1. Remaining calm even in situations that would cause many others to become angry, frustrated, panicky, etc.
   • 1900, Charles W. Chesnutt, The House Behind the Cedars, Chapter I,

     Who has not known some even-tempered old man or woman who seemed to have drunk of the fountain of youth?

Synonyms

• cool (in the sense of calm or relaxed)
• cool-headed

Antonyms

• hot-tempered
• quick-tempered
• short-tempered