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There is no prefix in the word "vigorous".
Other words for strong or vigorous are robust or active.
Vigorous means powerful and energetic. My dad is very vigorous because he's gotten a lot of muscle.
robust
Vigorous.
Working on the house in 100 degree weather was vigorous work.
vigorous
Robust
1. full of or characterized by vigor: a vigorous effort.2. strong; active; robust: a vigorous youngster. 3. energetic; forceful: vigorous steps; a vigorous personality.4. powerful in action or effect: vigorous law enforcement.5. growing well, as a plant.
1. full of or characterized by vigor: a vigorous effort.2. strong; active; robust: a vigorous youngster. 3. energetic; forceful: vigorous steps; a vigorous personality.4. powerful in action or effect: vigorous law enforcement.5. growing well, as a plant.
Some antonyms for vigorous are weak, frail, feeble, lethargic, weedy, and apathetic.
red blooded