peacefully
Word family
Synonym discussion
Sense: adverb/2
For sense adverb/2, peacefully suggests a quiet state with no worry, struggle, or disturbance. Calmly is close, but it often highlights self-control in a difficult moment, as in answering calmly during an argument. Quietly mainly describes low sound, so someone can speak quietly but still feel upset. Serenely is more literary and suggests a deeper, almost beautiful calm. Gently focuses on soft physical action rather than inner peace. A baby can sleep peacefully, a nurse can speak gently, and a witness can answer calmly. If a lake looks still at sunrise, serenely may fit better than peacefully.
Etymology
Peacefully was formed in English by adding the adverb ending -ly to peaceful. Peaceful comes from peace, a word that reached English through Old French from Latin pax, meaning peace. The adverb first kept the idea of living or acting without conflict, and it later also came to describe quiet, undisturbed rest or movement.