VIG'OROUS, adjective 1. Full of physical strength or active force; strong; lusty; as a vigorous youth; a vigorous body. 2. Powerful; strong; made by strength, either of body or mind; as a vigorous attack; vigorous exertions. The enemy expects a vigorous campaign. The beginnings of confederacies have been vigorous and successful.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI