"equanimous" in the adjective sense
1. collected, equanimous, poised, self-collected, self-contained, self-possessed
in full control of your faculties
"the witness remained collected throughout the cross-examination"
"perfectly poised and sure of himself"
"more self-contained and more dependable than many of the early frontiersmen"
"strong and self-possessed in the face of trouble"
Source: WordNet® (An amazing lexical database of English)
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