nonchalance

n. 无动于衷，冷淡

non-payment, non-poisonous, non-proliferation, non-resident, non-skid, non-smoker, non-smoking, non-starter, non-stick, non-stop, non-U, non-union, non-verbal, non-violence, non-violent, non-white, nonage, nonagenarian, nonce, nonce-word, nonchalant, nonchalantly, noncommittal, nonconformist, nonconformity, noncontemporaneous, nondescript, none, none but, none other than, none the less, none too, nonentity, nonesuch (also nonsuch), nonetheless, nonexistent, nonflammable, nonmilitary, nonpareil, nonphysical,