粗心 in English:

The loss resulting from careless work is very serious.

The car crashed because the driver was careless.

a careless driver

Only one careless mistake cost the company millions of dollars.

Careless as she was, she could never pass an examination.

Tatoeba: Where nothing ruins a passionate night of sentence-making like a poorly placed comma or, even worse, a careless typo.

My mother told me to do a careless job of it.

Keeping Mario in a state in which he can throw fireballs is a delicate process; that newfound power sometimes makes one cocky and careless.

Confused by her careless mistake, she burst into tears.

We shall never agree on such a careless plan.

not taking or ​showing enough ​care and ​attention: My son's ​teacher says that his ​work is often ​rather careless.

Don't be so careless about/with spelling. / a careless driver / She gave a careless shrug.

She was careless with money, so now she's in trouble financially.

If you weren't careless, your word processor wouldn't break down.

Mr Johnson was concerned about the amount of money that was being lost because of careless management.

The barn door had been carelessly left unlatched.

I carelessly dropped a vase.

This tool, if used carelessly, can be very dangerous.

I carelessly ran into the telegraph pole.

Today, after riding, while grooming the horse I carelessly got my right foot trod on.

I carelessly deleted your e-mail address and had to ask Russell in New Zealand for it.

If you drive carelessly, you will miss your turn.

If you carelessly ask, "got a boyfriend?" she'll be put on her guard and say, "why do you ask?"

Science can be dangerous when applied carelessly.

Susan crossed her legs, a little carelessly

Some books, if read carelessly, will do more harm than good.

They'll be attacked if they carelessly express an original viewpoint, so they only report on the safe options.

The young girl laughed carelessly.

Don't draw so carelessly.

Your essay was very carelessly written.