careless

a. 粗心的, 不关心的, 无忧无虑的

名词:carelessness 副词:carelessly 

care.less

adj.（形容词）
Taking insufficient care; negligent:
粗心的，疏忽的：不够当心的；忽视的：
例句：
a careless housekeeper; careless proofreading.
粗心的女管家；马马虎虎的校对

Marked by or resulting from lack of forethought or thoroughness:
轻率的：事先缺乏考虑的、不够细致周密的，由于事先缺乏考虑或不够细致周引起的：
例句：
a careless mistake.
粗枝大叶的错误

Showing a lack of consideration:
草率的，欠考虑的：
例句：
a careless remark.
草率的评论

Unconcerned or indifferent; heedless:
淡漠的：不关心的或冷淡的；不加注意的：
例句：
careless of the consequences.
不顾后果

Unstudied or effortless:
随便的：自然的或不费劲的：
例句：
danced with careless grace.
以毫不矫揉的优雅舞姿跳舞

Exhibiting a disposition that is free from cares; cheerful:
无忧无虑的：表现出轻松愉快的性情的；快活的：
例句：
a careless grin; a careless wave of the hand.
快活地咧着嘴笑；愉快的一挥手


【引伸】
care.lessly
adv.（副词）
care.lessness
n.（名词）
<参考词汇><同义词>careless,heedless,thoughtless,inadvertentThese adjectives apply to what is marked by insufficient care or attention.
这些形容词都表示不够小心谨慎的或不够注意的。
Careless often implies negligence:
Careless 经常含有疏忽的意思：
例句：
.It is natural for careless writers to run into faults they never think of. (George Berkeley).
.疏忽的作者会陷入他们从来没想到过的错误，这一点是很自然的. （乔治·贝克莱）。

Heedless suggests often reckless inattentiveness:
Heedless 常含有不顾后果的漫不经心的意思：
例句：
.We have always known that heedless self-interest was bad morals; we know now that it is bad economics. (Franklin D. Roosevelt).
.我们已经懂得，只顾草率地考虑自身利益在过去是道德败坏；我们现在知道它代表不利的经济情况. （富兰克林D·罗斯福）。

Thoughtless applies to actions taken without due thought or consideration:
Thoughtless 指没经过充分的思考或考虑而采取的行动：
例句：
.At length I recollected the thoughtless saying of a great princess, who, on being informed that the country people had no bread, replied, ‘Let them eat cake’. (Jean Jacques Rousseau).
.终于，我回忆起一位伟大的王后发表的轻率议论，她在被告知乡下人没有面包吃时回答说，‘让他们吃蛋糕吧’. （让·雅克·卢梭）。

Inadvertent is used of actions marked by unintentional lack of care:
Inadvertent 用于指不谨慎的行为，而这不谨慎是无心的：
例句：
With an inadvertent gesture she swept the vase off the table onto the floor.
她无意地做了个手势，把桌上的花瓶打翻到地上。