Webster's Revised Unabridged Dictionary · 1913

Impotent

Impotent , adjective

[French impotent, Latin impotens, -entis; pref. im- not + potens potent, powerful. See Potent.]

1.
Not potent; wanting power, strength. or vigor. whether physical, intellectual, or moral; deficient in capacity; destitute of force; weak; feeble; infirm.
There sat a certain man at Lystra, impotent inhis feet. — Acts xiv. 8
O most lame and impotent conclusion! — Shakespeare
Not slow to hear, Nor impotent to save. — Addison
2.
Wanting the power of self-restraint; incontrolled; ungovernable; violent.
Impotent of tongue, her silence broke. — Dryden
3.
(Medicine) Wanting the power of procreation; unable to copulate; also, sometimes, sterile; barren;
(Medicine) unable to achieve or sustain a penile erection.

Impotent , noun

One who is impotent. [Rare] — Shakespeare