arctic, biting, brisk, chilly, freezing, frigid, frosty, glacial, icy, nippy, raw, sharp, wintry, assured, collected, composed, coolheaded, deliberate, detached, impassive, imperturbable, level-headed, nonchalant, philosophical, placid, quiet, relaxed, self-controlled, self-possessed, serene, stolid, together, tranquil, unagitated, unflappable, unruffled