impotencyn. 無力、虛弱、軟弱無能、無能力、無效、無法可想、陽萎學術名詞陽痿：動物學、醫學勃起不全：動物學缺精：發生學英文釋義the quality of lacking strength or power; being weak and feeblean inability (usually of the male animal) to copulate