Vigorous definition: full of or characterized by vigor.. See examples of VIGOROUS used in a sentence. Master the word "VIGOROUS" in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. Anything vigorous is done with force and energy. Vigorous exercise makes you sweat, and a vigorous denial makes someone else sweat. Strong, healthy, and full of energy and enthusiasm. e.g. The vigorous exercise routine helped her build muscle quickly. (adjective) forceful and with great emphasis, used to refer to language or a mode of expression;