equanimous
adjective
equan·i·mous
(ˈ)ē¦kwanəməs,
(ˈ)e¦k-,
ə̇ˈk-
: possessing or displaying equanimity
a good-humored, equanimous individual 
Current Biography
Current Biography equanimously adverb
Word History
Etymology
Late Latin aequanimus, back-formation from aequanimitas