calm relaxed collected cool easy nerveless composed unruffled serene tranquil placid unperturbed untroubled together nonchalant imperturbable casual undisturbed unflappable sedate unworried insouciant peaceful unconcerned poised coolheaded unflustered easygoing possessed unfazed equable carefree unshaken recollected blithe level unemotional mellow unmoved breezy chilled controlled unexcitable smooth equal tolerant informal quiet limpid liberal mild impassive indulgent nonplussed lenient lax phlegmatic unbothered affable confident forbearing undemanding friendly patient dispassionate stoical flexible unhurried levelheaded permissive leisurely stolid amenable understanding still temperate considerate understated sanguine agreeable sure amiable downbeat pleasant generous cordial assured happy certain content comfortable firm restful unafraid steady brave settled courageous fearless unwavering