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Webster 1828 Edition

Adj.

untrub'led.

Not troubled; not disturbed by care, sorrow or business; free from trouble.

Not agitated; not ruffled; not confused; free from passion; as an untroubled mind.

Not agitated; not moved; as an untroubled lake.

Not disturbed or interrupted in the natural course; as untroubled nature.

Not foul; not turbid; clear; as an untroubled stream.

untroubled ‎(comparative more untroubled, superlative most untroubled)

Of or pertaining to a lack of worries.
Once the exams were over she once more enjoyed untroubled sleep.

at peace