I lost points on the test due to some careless grammar mistakes.
Don't be so careless with your cell phone; you might break it.
This word means “free of worries and responsibilities.”
If you had a carefree childhood, it means you enjoyed yourself because you didn't have much stress or worry in your life. A carefree vacation would be a trip on which you stop thinking about work and other obligations.
You can also describe a person as carefree or as having a carefree attitude, meaning that their personality is the type that doesn't worry a lot.
Being careless is negative, it means not giving the necessary attention or thought to your wordsactions. And being carefree is positive; it means feeling nice and light, without stress, worries, or heavy obligations.