IPA: /ˈvɪɡərəs/
KK: /ˈvɪɡərəs/
Full of energy and strength; done with a lot of force or enthusiasm.
She gave a vigorous workout at the gym today.
Comparative: more vigorous
Superlative: most vigorous
Vigorous → It is formed from "vigor" (from Latin "vigor", meaning liveliness or energy) and the suffix "-ous" (meaning full of). The word "vigorous" means full of energy or strength.
Think of 'vigor' as energy or liveliness, and remember that 'vigorous' means full of energy.