Use the adjective collected to describe a person who stays cool and calm, even under pressure.

There are certain people who always seem completely self-possessed and unflappable no matter what is going on around them. You can describe these people as collected. If a kid throws up on the school bus and the driver is unruffled, he is collected. A confident, poised trapeze artist is also collected. If you're upset, you might say, "I need to collect myself," and once you have calmed yourself, you are collected.

Definitions of collected
  1. adjective
    brought together in one place
    “the collected works of Milton”
    synonyms: gathered
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    uncollected, ungathered
    not brought together in one place
  2. adjective
    in full control of your faculties
    “the witness remained collected throughout the cross-examination”
    synonyms: equanimous, poised, self-collected, self-contained, self-possessed
    serenely self-possessed and free from agitation especially in times of stress
Word Family

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