Definitions for untroubled
Random House Webster's College Dictionary
not beset by troubles or disturbance or distress
"seemed untroubled by doubts of any kind"; "untroubled sleep"; "a kind untroubled face"
secure, unafraid, untroubled(adj)
free from fear or doubt; easy in mind
"he was secure that nothing will be held against him"
free from turmoil or worries
Of or pertaining to a lack of worries.