the quality of lacking strength or power; being weak and feeble
<noun.attribute>
an inability (usually of the male animal) to copulate
<noun.state>
Impotence \Im"po*tence\, Impotency \Im"po*ten*cy\, n. [L. impotenia inability, poverty, lack of moderation. See {Impotent}.] 1. The quality or condition of being impotent; lack of strength or power, animal, intellectual, or moral; weakness; feebleness; inability; imbecility.
Some were poor by impotency of nature; as young fatherless children, old decrepit persons, idiots, and cripples. --Hayward.
O, impotence of mind in body strong! --Milton.
2. Lack of self-restraint or self-control. [R.] --Milton.
3. (Law & Med.) Lack of procreative power; inability to copulate, or beget children; also, sometimes, sterility; barrenness; specifically, in males: the inability to achieve or sustain a penile erection; erectile dysfunction. [1913 Webster +PJC]
George tries, though. "Ah," he says, "like some Newcomer men. They don't feel truly masculine until they've given birth." He can't understand why Earthmen worry so much about impotency, though.