Adjectives

(s)peaceable, peace-lovinginclined or disposed to peace“they met in a peaceable spirit”, “peace-loving citizens”
(a)peaceful, peaceablenot disturbed by strife or turmoil or war“a peaceful nation”, “peaceful times”, “a far from peaceful Christmas”, “peaceful sleep”
(s)pacific, peaceabledisposed to peace or of a peaceful nature“the pacific temper seeks to settle disputes on grounds of justice rather than by force”, “a quiet and peaceable person”, “in a peaceable and orderly manner”