- n.: placidity, undisturbed, US also tranquility, tranquil condition, tranquillity, stillness, serenity, repose, quietude, quietness, peace, mitigation, impassivity, harmony, equilibrium, equanimity, equability, composure, calmness
- v.: pacify, lull
- adj.: quiet, tranquil, cool, calm
- adv.: still
- vi.: subside
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