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self-possessed

If you're self-possessed, you always seem to be calm and confident. It's easier to be successful as a substitute teacher if you're self-possessed than if you're nervous and uncertain.

Someone who's particularly poised can be described as self-possessed. It's a hard quality to fake, but a worthwhile one to aspire to; other people tend to take you more seriously if you're self-possessed. The adjective self-possessed and noun self-possession first appeared in English around 1740, with the sense of "(in) command of one's emotions."

Definitions of self-possessed
  1. adjective
    in full control of your faculties
    “strong and self-possessed in the face of trouble”
    synonyms: collected, equanimous, poised, self-collected, self-contained
    composed
    serenely self-possessed and free from agitation especially in times of stress
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