nonchalant

Universal Words adjective behaving in a calm and relaxed way; giving the impression that you are not feeling any anxiety: to appear / look / sound nonchalant * 'It'll be fine,' she replied, with a nonchalant shrug. nonchalance noun [U]: an air of nonchalance nonchalantly adverb: He was leaning nonchalantly against the wall. * 'I already know,' she replied nonchalantly.