Wordnet 3.0
ADJECTIVE (1)
1. 
 free of trouble and worry and care; 
- Example: "the carefree joys of childhood"- Example: "carefree millionaires, untroubled financially"[syn: carefree, unworried]
WordNet (r) 3.0 (2006):
unworried
    adj 1: free of trouble and worry and care; "the carefree joys of
           childhood"; "carefree millionaires, untroubled
           financially" [syn: carefree, unworried]