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Definition of tranquil : Quiet; calm; undisturbed; peaceful; not agitated; as, the atmosphere is tranquil; the condition of the country is tranquil.

Synonyms:

unflurried, reasonable, low, measured, fluid, fair, lenient, noneffervescent, equable, self-possessed, sober, pleasing, stilly, hushed, agreeable, restful, smooth, soundless, comforting, silent, balmy, politic, unperturbed, amicable, sedative, unagitated, angry, suave, liquid, fluent, whispering, even, tame, unflustered, bland, good-tempered, perturbed, legato, muted, agitated, paradisiacal, patient

calm, soft, gentle, soothing, temperate, alleviated, composed, quiet, restrained, subdued, pacific, innocuous, relaxed, cool, easy, moderate

peaceful, undisturbed, unruffled, sedate, collected

inactive, resting, dead, static, stationary, sleeping, immobile, motionless, unmoving, dormant, inert, stagnant, still, idle, standing, vegetative, fixed, becalmed, languid

non-aggressive, friendly, quiescent, orderly, pastoral, reposeful, halcyon, idyllic, untroubled

imperturbable, nonchalant, mild, poker-faced, frigid, demure, passionless, dispassionate, detached, stoic, inscrutable, impassive, controlled, reserved, stoical, stolid, level-headed, placid, aloof, meek, apathetic, self-controlled, self-composed, serene, staid, neutral, steady, easygoing, unflappable, unexcitable, deadpan, even-tempered, numb, unhurried, cold-blooded

Usage examples:

• Keep tranquil and cool, Lottie's around!" - "Wives and Widows; or The Broken Life", Ann S. Stephens.
• Fortunately the bed was a good one, and as I had expected it to be uncomfortable I went to sleep in a more tranquil humour. - "The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons", Jacques Casanova de Seingalt.
• " Citizen Manette, be tranquil. - "A Tale of Two Cities A Story of the French Revolution", Charles Dickens.