Robust, vigorous (5)
I believe the answer is:
lusty
I believe this is a double definition.
'robust' is the first definition.
(synonyms)
'vigorous' is the second definition.
(I've seen this in another clue)
(Other definitions for lusty that I've seen before include "Brawny" , "Robust - vigorous" , "Full-blooded" , "Full of health, vigour" , "Stout" .)