even-tempered 
adjective
Not easily annoyed or made angry: he was a gentle and even-tempered man...
- Obviously I can't imagine why these keys would ever be useful to someone as calm, level-headed and even-tempered as myself.
- One man is wrathful and always angry, and another even-tempered and never angry.
- She talked slowly, in her calm, even-tempered way.
Synonyms
serene, calm, composed, poised, tranquil, relaxed, easy-going, mild, mellow, unworried, untroubled, unbothered, unruffled, unflustered, unexcitable, imperturbable, placid, equable, stable, well balanced, level-headed
informal unflappable, together, laid-back, unfazed
rare equanimous
- alphabet organization
- alphabet poem
- alphabet song
- alphabet soup
- alphabetting
- alpha blocker
- alpha cell
- alpha cellulose
- Alpha Centauri
- alphachloralose
- Alpha course
- alpha diversity
- alphafetoprotein
- alpha geek
- alpha-helical
- alpha helix
- alpha-hydroxy acid
- alpha male
- alphameric
- alphametic
- alpha minus
- alphanumeric
- alphanumerical
- alpha particle
- alpha plus