1 strong and active; robust.
2 (of a plant) growing strongly.
3 forceful; acting or done with physical or mental vigour; energetic.
4 full of vigour; showing or requiring physical strength or activity.
Derivatives:
vigorously adv. vigorousness n.
Etymology: ME f. OF f. med.L vigorosus f. L vigor (as VIGOUR)
Useful english dictionary. 2012.