Synonyms of the word

even-tempered

• adj. Remaining calm even in situations that would cause many others to become angry, frustrated, panicky, etc.

equable

• adj. Unvarying, calm and steady; constant and uniform.
• adj. (of temperature) Free from extremes of heat or cold.
• adj. (of emotions etc) Not easily disturbed; tranquil.

good-natured

• adj. Of or pertaining to an amicable, kindly disposition.

good-tempered

• adj. Not easily irritated; affable.

placid

• adj. calm and quiet; peaceful; tranquil.