Webster's 1828 Dictionary
UNTROUBLED
a.untrub'led. 1. Not troubled; not disturbed by care, sorrow or business; free from trouble.
2. Not agitated; not ruffled; not confused; free from passion; as an untroubled mind.
3. Not agitated; not moved; as an untroubled lake.
4. Not disturbed or interrupted in the natural course; as untroubled nature.
5. Not foul; not turbid; clear; as an untroubled stream.
UNTROUBLEDNESS
n.State of being free from trouble; unconcern. [Not used. ]
New American Oxford Dictionary
untroubled
un trou bled |ənˈtrəbəld | ▶adjective not feeling, showing, or affected by anxiety or problems: a man untroubled by a guilty conscience | an untroubled gaze.
Oxford Dictionary
untroubled
un |troubled |ʌnˈtrʌb (ə )ld | ▶adjective not feeling, showing, or affected by anxiety or problems: a man untroubled by a guilty conscience | an untroubled gaze.
American Oxford Thesaurus
untroubled
untroubled adjective they all thought I was untroubled, but I was really falling to pieces: unworried, unperturbed, unconcerned, unruffled, undismayed, unbothered, unalarmed, unflustered; insouciant, nonchalant, composed, blasé, carefree, calm, serene, tranquil, relaxed, halcyon, comfortable, at ease, happy-go-lucky, blissful, laid-back, mellow; informal supercool.
Oxford Thesaurus
untroubled
untroubled adjective a man untroubled by a guilty conscience: unworried, unperturbed, unconcerned, unruffled, undisturbed, undismayed, unbothered, unagitated, unflustered; unanxious, insouciant, nonchalant, blasé, carefree, blithe, casual, without a care in the world; serene, composed, relaxed, peaceful, tranquil, at ease, devil-may-care, happy-go-lucky, {cool, calm, and collected }; trouble-free, unbroken, uninterrupted; informal laid-back, unflappable. ANTONYMS troubled, anxious.
Sanseido Wisdom Dictionary
untroubled
ù n tr ó u bled 形容詞 〈人が 〉心配していない ; 〈生活などが 〉じゃまされない, 穏やかな ; 悩まされない .