coolheaded Synonyms

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