1. Not beset by troubles or disturbance or distress
   "seemed untroubled by doubts of any kind"; "untroubled sleep"; "a kind untroubled face" 
2. Free from fear or doubt; easy in mind
   - secure, unafraid 
3. Free from turmoil or worries
   "untroubled times"

See also: carefree, clear, dreamless, quiet, trouble-free, unconcerned, undisturbed, unharassed, unmolested, unworried

Antonym: troubled

• preponderating
• prepone
• prepose
• preposition
• prepositional
• prepositional object
• prepositional phrase
• prepositionally
• prepositive
• prepossess
• prepossessing
• prepossession
• preposterous
• preposterously
• prepotency
• prepotent
• preppie
• preppy
• preprandial
• preprint
• prepubertal
• prepuberty
• prepubescent
• prepuce
• prepupal