composed
kum-POHZDadjMeaning in control of your feelings; not flustered
Memory hook the COMPOSER stays COMPOSED. When the stage lights flicker during her recital, Lila keeps playing without missing a note. She stays composed.
Even when the lights went out, the pianist stayed composed and went on playing.
In context Though she was nervous inside, Maya looked composed at the interview: she sat up straight, answered slowly and never once fidgeted.
Similar collected, self-possessed, poised, cool
Opposite flustered, agitated, rattled