vigorous Get Printable Handwriting (vig-or-ous) 3 syllables Rhymes Learn It! Spelling Test Definition adjective. demanding strength or energy; very active Example Sentence The team had a vigorous workout. Synonyms active; alive; arduous; athletic; brisk; strong Antonyms feeble; weak; nap Rhymes Three Syllable Rhymes (2) rigorous vigorous Share with your friends: