Context: Someone is careless in learning something, that has usually needs extra attention than other things.
He is careless in learning to drive the car.
Please check the sentence.
Careless is incorrect. Here are examples for "careless". If you are careless when driving a car, you will certainly have an accident.
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Careless is incorrect. Here are examples for "careless".
If you are careless when driving a car, you will certainly have an accident.
He was careless when he filled out the form. It was full of mistakes.
I do not know what you are trying to say here.