self-possessed Synonyms

equanimous self-collected collected self-contained poised level-headed laid-back unagitated undisturbed unruffled unmoved tranquil together levelheaded coolheaded imperturbable as cool as a cucumber unperturbed unflustered unemotional self-controlled unflappable untroubled unfazed unexcitable even-tempered steady sober equable easy dispassionate cool-headed cool controlled confident composed calm assertive impassive patient serene self-confident self-assured sedate relaxed quiet placid phlegmatic peaceful assured