vigour
Concise Oxford English Dictionary © 2008 Oxford University Press:
vigour /ˈvɪɡə(r)/ (US vigor)
▶noun physical strength and good health.
■ effort, energy, and enthusiasm.
– derivatives
vigourless adjective.
vigourless adjective.
– origin ME: from OFr., from L. vigor, from vigere ‘be lively’.
'vigour' also found in these Oxford entries:
animate
- animation
- atrophy
- back
- brio
- con brio
- dash
- decay
- devitalize
- etiolated
- fade
- flush
- fresh
- gangbuster
- gusto
- hefty
- heterosis
- heyday
- hybrid vigour
- inanition
- inert
- insipid
- lifeless
- limp
- lusty
- male menopause
- moribund
- namby-pamby
- nerveless
- prime
- racy
- revivify
- rip-roaring
- ripsnorting
- sap
- set
- snap
- throw
- tonic
- untiring
- verve
- vigor
- welly
- wilt
- youth
- zip

