Peaceful describes something calm and tranquil, not at war. The ocean seems peaceful when the waves lap gently at your feet, and a country can be peaceful when it's not fighting anyone.

Peace comes from the Latin word pax meaning, "tranquility, absence of war." Add the suffix ful which means — you guessed it — "full" and you have something full of peace, like a protest where nobody gets hurt. It refers to being passive, committed to nonviolence, like Martin Luther King Jr.'s peaceful protests during the Civil Rights Movement. It's also the mellowness that inspired the Eagles to sing, "I got a peaceful, easy feeling that you won't let me down."

Definitions of peaceful
  1. adjective
    not disturbed by strife or turmoil or war
    “a peaceful nation”
    peaceful times”
    “a far from peaceful Christmas”
    peaceful sleep”
    synonyms: peaceable
    nonaggressive, unaggressive
    not aggressive; not given to fighting or assertiveness
    characterized by friendship and good will
    idyllically calm and peaceful; suggesting happy tranquillity
    conducive to peace
    not directly at war
    pacific, peaceable
    disposed to peace or of a peaceful nature
    dovish, pacifist, pacifistic
    opposed to war
    peace-loving, peaceable
    inclined or disposed to peace
    characterized by an absence or near absence of agitation or activity
    abstaining (on principle) from the use of violence
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    not peaceful
    (especially of weather) affected or characterized by storms or commotion
    characterized by enmity or ill will
    belligerent, militant, war-ridden, warring
    engaged in war
    hawkish, militant, warlike
    disposed to warfare or hard-line policies
    stormy, tempestuous
    characterized by violent emotions or behavior
    not disposed to peace
    acting with or marked by or resulting from great force or energy or emotional intensity
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  2. adjective
    peacefully resistant in response to injustice
    synonyms: passive
    abstaining (on principle) from the use of violence
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