Synonyms for tranquil

modified

1. Said especially of people

   calm, serene, composed, agreeable, gentle, unexcited, unexcitable, placid, amicable, peaceful, pacific, untroubled, unruffled, sober, quiet, reasonable, measured, lenient, even-tempered, smooth, gentle, poised, at ease, well-adjusted, patient, cool; see also calm 1, serene.

   Antonyms agitated, perturbed, angry, hysterical.

2. Said especially of weather, nature, etc.

   quiet, peaceful, calm, mild, soft, temperate, moderate, low, serene, halcyon, hushed, still, whispering, murmuring, pleasing, comforting, restful, tame, sedative, soothing, even, balmy, southerly, agreeable, pastoral, paradisiacal; see also calm 2, fair 3, serene. See syn. study at calm.