careless
/ˈkeəlɪs/adjective
1- not giving sufficient attention or thought to avoiding harm or errors不小心的; 粗心的：
she had been careless and had left the window unlocked.
她粗心大意, 结果窗户没锁。
1.1
- (of an action or its result) showing or caused by a lack of attention（行为, 结果）草率的; 敷衍的：
he admitted careless driving
他承认驾驶疏忽
a careless error.
一个疏忽性错误。
1.2
- predic.
careless of/about
not concerned or worried about满不在乎的; 无忧无虑的： he was careless of his own safety.
他满不在乎自己的安全。
1.3
- showing no interest or effort; casual不感兴趣的, 不做努力的; 随意的：
she gave a careless shrug.
她随意地耸耸肩。
派生词
carelessly
adverbcarelessness
noun词源
Old English carlēas 'free from care' （see CARE, -LESS）.