impotence impotence /ˈɪmpətəns/

noun

1. () The quality of lacking strength or power; being weak and feeble  ( powerlessness , impotence , impotency )
   the quality of lacking strength or power; being weak and feeble
   
2. An inability (usually of the male animal) to copulate  ( impotence , impotency )
   an inability (usually of the male animal) to copulate