Calm, unconcerned, and collected, composed, indifferent, blasé, detached, casual, insouciant, cool, collected, cool as a cucumber, airy, unemotional, dispassionate, apathetic, offhand, and laid-back.
Calm, unconcerned, and collected, composed, indifferent, blasé, detached, casual, insouciant, cool, collected, cool as a cucumber, airy, unemotional, dispassionate, apathetic, offhand, and laid-back.