careful
- careless - carefree
‘careful’
If you are careful, you do something with a lot of attention.
She told me to be careful with the lawnmower.
He had to be careful about what he said.
This law will encourage more careful driving.
‘careless’
If you are careless, you do things badly because you are not giving them enough attention. Careless is the opposite of careful.
I had been careless and let him wander off on his own.
Some parents are accused of being careless with their children's health.
‘carefree’
Someone who is carefree has no worries and can therefore enjoy life.
When he was younger, he was carefree.
...his normally carefree attitude.