操作不仔细怎么说英语

If someone is not careful when they are doing something, you can say that they are "careless" or "inattentive." For example:
"He was careless and spilled the milk all over the counter."
"She was inattentive and didn't realize she had left the stove on."
You could also say that someone is "sloppy" or "negligent" if they are not careful and their work or behavior shows a lack of attention to detail. For example:
"His sloppy workmanship resulted in several mistakes."
"She was negligent in her duties and failed to follow safety procedures."
It's important to be careful and attentive when doing tasks, as mistakes or accidents can often be avoided by paying attention and being careful.