See peaceful in Webster's New World Roget's A-Z Thesaurus II
adjective
Not excited or emotionally agitated:
calm, placid, serene, tranquil. See calmMotionless and undisturbed:
calm, halcyon, placid, quiet, serene, still, stilly, tranquil, untroubled. See calmInclined or disposed to peace; not quarrelsome or unruly:
irenic, pacific, pacifical, pacifist, pacifistic, peaceable. See peace
Learn more about peaceful