carefree
carefree (kâr"frē`) , adjective
1.
Free of trouble and worry and care; as, the carefree joys of childhood; carefree millionaires, untroubled financially.
2.
nonchalant in a cheerful manner.
3.
cheerfully irresponsible; as, carefree with his money. Opposite of careful.
4.
same as unconcerned. Opposite of concerned.