Englishlaid-back
adjective informal
relaxed, at ease, easygoing, equable, free and easy, easy, casual, informal, friendly, nonchalant, insouciant, unexcitable, imperturbable, unemotional, unruffled, blasé, blithe, cool, collected, cool, calm, and collected, calm, composed, self-possessed, levelheaded, self-controlled, unperturbed, unflustered, unworried, unconcerned, placid, peaceful, tranquil, serene, low-key, understated, downbeat;
leisurely, unhurried;
stoical, phlegmatic, mellow, forbearing, live-and-let-live, tolerant;
informal unflappable, together, chilled;
North American, informal nonplussed.
▷antonyms tense, edgy, uptight.