Grade 5 peacefully Get Printable Handwriting (peace-ful-ly) 3 syllables Rhymes Learn It! Spelling Test Definition adverb. quiet; calm; free from war or conflict. Example Sentence Martin Luther King protested peacefully. Synonyms calm; placid; quiet; restful; serene; tranquil Antonyms quarrelsome; warlike; agitated; noisy; stormy Rhymes Three Syllable Rhymes (1) peacefully Share with your friends: