1 synonym for Tranquility

peaceful, tranquil, serene, composed, placid, relaxed, still, quiet, unruffled, undisturbed, untroubled, cool, collected, sedate, restful, easygoing, mild, gentle, pacific, unflappable, imperturbable, laid-back, mellow, smooth, temperate, unagitated, hushed, halcyon, low-key, nonchalant, placatory, unexcitable, unperturbed, unshaken, unshakable, unworried, at ease, at peace, cool-headed, even-tempered, level-headed, self-possessed, self-controlled, tranquilized, unbothered, unflustered [x]