noun
1.
Synonyms: power 4, energy, force, might, muscle, puissance, sinew, strength, vigor, virtue
Antonyms: impotence
2.
Synonyms: efficacy 1, capability, effectiveness, efficiency
3.
Synonyms: energy 2, birr, go, hardihood, ||moxie, pep, tuck, vigor
Antonyms: impotence