NONCHALANT Meaning of NONCHALANT in English [ 'nɒnʃ(ə)l(ə)nt ]■ adjective casually calm and relaxed.Derivativesnonchalance noun~ly adverb OriginC18: from Fr., lit. 'not being concerned', from the verb nonchaloir . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004