As a noun vigour
is active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; force; energy.
As an adverb convalescently is
in the manner of a convalescent; with increasing strength or vigour.
* vigor (US)
* vygour (obsolete)
Active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; force; energy.
* (rfdate) :
(biology) Strength or force in animal or force in animal or vegetable nature or action.
- The vigour of this arm was never vain.
Strength; efficacy; potency.
* 1667 , :
- A plant grows with vigour.
- But in the fruithful earth His beams, unactive else, their vigour find.
Vigour and its derivatives commonly imply active strength, or the power of action and exertion, in distinction from passive strength, or strength to endure.
* hybrid vigor/hybrid vigour