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

The above text is a snippet from Wiktionary: impotent
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!