How to use "careless" in a sentence

'It was very silly and careless of me.'

Then she began to grow careless

'Mrs de Winter was careless for a moment and she died.'

"And someone got careless," Elliot said.

"Someone got careless and stupid

'Don't you think, Miss Marple,' I said, 'that problems may be caused by careless talk?'

'Dear Vicar,' said Miss Marple, 'careless talk is often unkind, but it is also often true.'