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Teachers have to be careful when criticizing pupils.
Even the most careful proofreader will miss the occasional error.
You must be careful who you accept a lift from.
Be careful that the medicine is kept away from children.
People should be more careful about the things they say.
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.
a carefully worded letter
He washed the antique plates very carefully.
This is the American English definition of careful. View British English definition of careful.