marvelous Get Printable Handwriting (mar-vel-ous) 3 syllables Rhymes Learn It! Spelling Test Definition adjective. causing wonder or amazement; of the highest quality; splendid. Example Sentence The play we attended was marvelous. Synonyms amazing; wonderful; great; outstanding Antonyms awful; dreadful Rhymes Three Syllable Rhymes (1) marvelous Share with your friends: