核心差别
careless 强调careless 是一个形容词，careful 则侧重指做事或思考时非常注意细节
使用场景对比
| 对比方面 | careless | careful |
|---|---|---|
| 核心含义 | careless 是一个形容词，指做事不细心、疏忽大意，或对事物漠不关心、毫不在意的态度。 | 指做事或思考时非常注意细节，避免错误或危险，强调谨慎和细致的态度。 |
| 词性 | 形容词 | 形容词 |
| 使用语域 | careless 常用于描述人的行为或态度，可作定语或表语，常与介词 about 或 with 连用，表示对某事的疏忽。 | 常用于'be careful (with/about/of/to do)'结构中，表示对某事物或行为保持谨慎。 |
对比例句
She was careless and left her keys in the car.
她太粗心了，把钥匙忘在了车里。
He made a careless mistake on the test and lost points.
他在考试中犯了一个粗心的错误，丢了分。
Be careful when you cross the street, there's a lot of traffic today.
过马路时要小心，今天车流量很大。
She's always careful with her money, saving a little each month.
她总是很谨慎地管理自己的钱，每个月都会存一点。
常见误用提醒
使用 careless：He is careless to do his homework. → He is careless about doing his homework. (错误：careless 后不能直接接不定式 to do。正确：应使用介词 about 加动名词 doing，表示对做某事不细心。)
使用 careless：She is careless for her health. → She is careless about her health. (错误：careless 后误用介词 for。正确：应用 about 表示对某事的疏忽或不关心，这是固定搭配。)
使用 careful：I careful drive. → I drive carefully. (错误地将形容词'careful'直接用作副词修饰动词。正确用法是使用副词形式'carefully'来修饰动词'drive'。)