UNTROUBLED
untroubled
(adjective) free from turmoil or worries; “untroubled times”
secure, unafraid, untroubled
(adjective) free from fear or doubt; easy in mind; “he was secure that nothing will be held against him”
untroubled
(adjective) not beset by troubles or disturbance or distress; “seemed untroubled by doubts of any kind”; “untroubled sleep”; “a kind untroubled face”
Source: WordNet® 3.1
Etymology
Adjective
untroubled (comparative more untroubled, superlative most untroubled)
Without worries; free from care.
Source: Wiktionary