imperturbable Synonyms

unflappable as cool as a cucumber undisturbed unruffled unmoved tranquil together stolid stoical stoic steady sober laid-back easygoing unperturbed unflustered unemotional self-controlled untroubled unfazed unexcitable even-tempered levelheaded level-headed serene self-possessed sedate equable dispassionate detached cool-headed cool controlled confident composed collected calm equanimous even fiducial relaxed quiet poised placid phlegmatic philosophical peaceful patient nonchalant impassive