impotent

Etymology

From Old French impotent, from Latin impotēns, from in- (expresses negation) + potēns (“powerful”).

adj

1. lacking physical strength or vigor; weak
2. lacking in power, as to act effectively; helpless
   Technology without morality is barbarous; morality without technology is impotent 1984, Freeman J. Dyson, Weapons and Hope
3. incapable of sexual intercourse, often because of an inability to achieve or sustain an erection, having impotentia coeundi
4. (of a male) sterile
5. (obsolete) lacking self-restraint

noun

1. a man who has erectile dysfunction
2. an impotent or powerless person