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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.
a carefully worded letter
He washed the antique plates very carefully.
This is the British English definition of careful. View American English definition of careful.