Rigorous also denotes thorough or accurate way, whereas vigorous defines the energetic attribute, it means lively and strength of body or mind. Rigorous and vigorous both are used to define the attitude, a way or an approach with some specific characteristics. Vigorous means strong and healthy, robust, or forceful and energetic. Find out the origin, usage, and translations of the word vigorous in different contexts and languages. VIGOROUS meaning: 1 : healthy and strong; 2 : done with great force and energy Anything vigorous is done with force and energy. Vigorous exercise makes you sweat, and a vigorous denial makes someone else sweat.