Definition from macmillandictionary.com
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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.
Brighton welcomes careful drivers.
Please be very careful with those plates!
The project needs careful planning.
After careful consideration, we are giving the prize to a children’s book.
She took a few careful steps into the water.
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.