Tranquil means calm, peaceful, and free from disturbance. It describes a serene state, such as a quiet lake or a person’s relaxed mood. The word often conveys a sense of soothing stillness. Tranquil means free from commotion, disturbance, or anxiety; calm, peaceful, or quiet. Find the origin, usage, and translations of tranquil in various languages and dictionaries. Synonyms for TRANQUIL : quiet, peaceful, serene, placid, restful, calm, hushed, quieted; Antonyms of TRANQUIL : loud, boisterous, tumultuous, raucous, noisy, rowdy, unquiet, clamorous Something that is tranquil is calm and peaceful . The tranquil atmosphere of The Connaught allows guests to feel totally at home. The place was tranquil and appealing.