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Teachers have to be careful when criticizing pupils.
Even the most careful proofreader will miss the occasional error.
People should be more careful about the things they say.
You must be careful who you accept a lift from.
Be careful that the medicine is kept away from children.
She was careful to keep her records up to date.
We’re going to have to be more careful now that Dad’s lost his job.
She’s always been careful with money.
There’s some ice there – be careful!
Careful, Peter! You’ll fall!
If you’re not careful, you’ll break it.
You can’t be too careful when it comes to taking financial advice.
This is the British English definition of careful. View American English definition of careful.