impotent

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”

3. Incapable of sexual intercourse, often because of an inability to achieve or sustain an erection, having impotentia coeundi.

   “A person smeared with the excrement of a mouse was rendered impotent, according to Pliny the Elder.”

4. Sterile
5. (obsolete)Lacking self-restraint

   “Then, impotent of tongue (her ſilence broke) / Thus turbulent in rattling tone ſhe ſpoke.”

noun

1. A man who has erectile dysfunction
2. An impotent or powerless person