Robust \rō-ˈbəst, ˈrō-(ˌ)bəst\ adj. 1. strong and healthy; hardy; 2. strongly built; 3. requiring bodily strength or endurance; 4. effective in all or most situations. –robustly adv., robustness n. 1540–1550; which definition in the entry best clarifies the precise meaning of the word robust in this sentence? the personal trainer developed a new exercise routine that proved to be too robust for her clients. definition 1definition 2definition 3definition 4