vigorous meaning
EN
[ˈvɪɡəɹəs] 
US - AdjectiveCOMmore vigorousSUPmost vigorousSUF-ous
- Physically strong and active.
- Rapid of growth.
- Physically strong and active.
- More Examples
- Used in the Middle of Sentence
- A microscopical examination of the yeast taken from these rapid vigorous fermentations will only be able to give useful conclusions in one respect.
- For the masters of the Kremlin have been no less aware of the sinister potentialities of a healthy and vigorous supercolossus whose population was at least three times as large as their own.
- Used in the Middle of Sentence
Definition of vigorous in English Dictionary
- Part-of-Speech Hierarchy
- Adjectives
- Adjectives
- en vigorously
- en vigorousness
Source: Wiktionary
Grammatically, this word "vigorous" is an adjective.