Source : WordNet®

untroubled
     adj 1: not beset by troubles or disturbance or distress; "seemed
            untroubled by doubts of any kind"; "untroubled sleep";
            "a kind untroubled face" [ant: {troubled}]
     2: free from fear or doubt; easy in mind; "secure himself, he
        went out of his way to help others" [syn: {secure}, {unafraid}]
        [ant: {insecure}]
     3: free from turmoil or worries; "untroubled times"