composed

adjectives

serenely self-possessed and free from agitation especially in times of stress

"the performer seemed completely composed as she stepped onto the stage"; "I felt calm and more composed than I had in a long time"

composed

antonym

discomposed

is similar to

not agitated; without losing self-possession

"spoke in a calm voice"; "remained calm throughout the uproar"; "he remained serene in the midst of turbulence"; "a serene expression on her face"; "she became more tranquil"; "tranquil life in the country"

calm, serene, tranquil, unagitated

is similar to

not easily perturbed or excited or upset; marked by extreme calm and composure

"hitherto imperturbable, he now showed signs of alarm"; "an imperturbable self-possession"; "unflappable in a crisis"

imperturbable, unflappable

is similar to

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"

collected, equanimous, poised, self-collected, self-contained, self-possessed

is similar to

marked by calm self-control (especially in trying circumstances); unemotional

"play it cool"; "keep cool"; "stayed coolheaded in the crisis"; "the most nerveless winner in the history of the tournament"

cool, coolheaded, nerveless

is similar to

free from emotional agitation or nervous tension

"the waiters were unflurried and good natured"; "with contented mind and unruffled spirit"- Anthony Trollope

unflurried, unflustered, unperturbed, unruffled