Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Lacking physical strength or vigor; weak.
  • adj. Lacking in power, as to act effectively; helpless: "Technology without morality is barbarous; morality without technology is impotent” ( Freeman J. Dyson).
  • adj. Incapable of sexual intercourse, often because of an inability to achieve or sustain an erection.
  • adj. Sterile. Used of males.
  • adj. Obsolete Lacking self-restraint.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Lacking physical strength or vigor; weak.
  • adj. Lacking in power, as to act effectively; helpless
  • adj. Incapable of sexual intercourse, often because of an inability to achieve or sustain an erection.
  • adj. Sterile.
  • adj. Lacking self-restraint.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not potent; wanting power, strength. or vigor. whether physical, intellectual, or moral; deficient in capacity; destitute of force; weak; feeble; infirm.
  • adj. Wanting the power of self-restraint; incontrolled; ungovernable; violent.
  • adj. Wanting the power of procreation; unable to copulate; also, sometimes, sterile; barren
  • n. One who is impotent.

from The Century Dictionary and Cyclopedia

  • Not potent; lacking power, strength, or vigor, physical, intellectual, or moral; powerless; weak; feeble.
  • Wholly lacking in sexual power: said of the male, and rarely of the female.
  • Lacking the power of self-restraint; destitute of self-command; ungovernable.
  • n. One who is feeble, infirm, or languishing under disease.
  • n. A male without sexual power.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (of a male) unable to copulate
  • adj. lacking power or ability

Etymologies

Middle English, from Old French, from Latin impotēns, impotent- : in-, not; see in-1 + potēns, potent; see potent.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin impotēns, from in- (expresses negation) + potēns ("powerful"). (Wiktionary)

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