形容詞 nonchalant:

1. marked by blithe unconcern
   同義詞：casual, insouciant

1. Marked by blithe unconcern; nonchalant.
   漫不經心的; 漠不關心的
2. Carefree and nonchalant; jaunty.
   無憂無慮的無憂無慮的和不關心的; 快活的

non.cha.lant

adj.（形容詞）
Seeming to be coolly unconcerned or indifferent.See Synonyms at cool
漠不關心的，冷淡的：看上去漠不關心的或冷淡的參見 cool

來源：
French
法語
from Old French [present participle of] nonchaloir [to be unconcerned]
源自 古法語 [] nonchaloir的現(xiàn)在分詞 [不關心的]
non- [non-]
non- [缺少，無]
chaloir [to cause concern to] from Latin calôre [to be warm, heat up] * see kel…-
chaloir [引起關切] 源自 拉丁語 calôre [變得熱心或激動] *參見 kel…-

【引伸】
non.chalant.ly
adv.（副詞）
<注釋>A nonchalant person is not likely to become warm or heated about anything,a fact that is underscored by the etymology of the wordnonchalant. Non-,the first part of the word, is easy to spot as a familiar negative prefix;since this word was formed in Old French,we havenon-, the Old French descendant of Latin nôn-. The second element,chalant, is the Old French present participle of the verb chaloir, meaning .to be concerned..This in turn came from the Latin wordcalôre, which from its concrete sense .to be hot or warm. developed the figurative sense .to be roused or fired with hope, zeal, or anger..Obviously the Old French verbchaloir has lost some of the warmth of Latin calôre, but then, the nonchalant person has little warmth or concern.The wordnonchalant is first recorded in English before 734, although Frenchnonchalance, a derivative of French nonchalant, seems to have entered English first. Englishnonchalance is first recorded in '78.
態(tài)度冷漠的人是不太可能變得熱心或對某事激動的，這一事實被詞語nonchalant的詞源所強調。 Non-，這個詞的第一部分， 很容易認出是個很熟悉的否定前綴；因為此詞形成于古法語，我們可以說non-，來自 拉丁語 non- 在古法語中的衍生詞。 第二個組成部分chalant， 是動詞 chaloir 的古法語現(xiàn)在分詞， 意思是.擔憂的，關心的.。此詞同樣也來自于拉丁詞calere ， 從其具體的感覺.熱的或暖和的.演變到比喻的感覺.被激起或引起希望、熱心或憤怒.。很明顯古法語動詞chaloir 已去掉了一些拉丁語 calere 的溫暖， 不過，冷漠的人確是幾乎沒有什么熱心或關心的。詞語nonchalant 在734年前第一次被記錄在英語中， 盡管法語nonchalence, 是法語 nonchalant 的派生詞似乎已首先進入英語。 英語中的nonchalance 于'78年第一次被記錄下來