coolheaded Synonyms

nerveless cool as cool as a cucumber levelheaded level-headed laid-back zen undisturbed unshaken unstrained unruffled unmoved unworried imperturbable cool as a cucumber well-balanced unperturbed unflurried unemotional self-controlled unflappable untroubled unexcitable even-tempered tranquil together placid phlegmatic peaceful impassive equable composed collected calm assured poised practical pragmatic steady sober serene sensible self-possessed relaxed reasonable rational quiet aloof