careless/ˈkeəlɪs/
adj.1. 粗心的；疏忽的A careless driver is a danger.粗心的司机是一种危险。
This is careless work. Do it again!这工作做得粗枝大叶，重做!
Our neighbour's a very careless bis driver; he never thinks about what he's responsible for.我们的邻居是个粗心大意的公共汽车驾驶员，从来不考虑自己有什么责任。
2. 由于粗心而引起的；草率的He failed his maths examination because of his careless work.他由于粗心大意，数学考试没及格。
a careless mistake由于粗心而犯的错误
3. 无忧无虑的；快乐的careless life无忧无虑的生活
4. 欠思考的；不精细的；不介意的He is careless in speech.他说话欠思考。