1. free of trouble and worry and care

- the carefree joys of childhood

- carefree millionaires, untroubled financially

Similar word(s): untroubled, unworried

2. cheerfully irresponsible

- carefree with his money

Similar word(s): irresponsible, freewheeling, slaphappy

Sentences with carefree as an adjective:

- He left his cell phone behind and enjoyed a carefree summer day at the beach.