NONCHALANT

adj. cool, unexcited, unexcitable, unperturbed, imperturbable, undisturbed, untroubled, unflappable, unruffled, dispassionate, unemotional, detached, distant, unconcerned, indifferent, pococurante, insouciant, uninterested, aloof, blasé, offhand, calm, collected, composed, easygoing, free and easy, happy-go-lucky, casual, relaxed, at ease; unenthusiastic, apathetic; Colloq laid-back, together: How can you be so nonchalant about important issues that affect all our lives?!