How do you spell Impotent

Available Definitions:
1)  a. - Not potent; wanting power, strength. or vigor. whether physical, intellectual, or moral; deficient in capacity; destitute of force; weak; feeble; infirm.
2)  a. - Wanting the power of self-restraint; incontrolled; ungovernable; violent.
3)  a. - Wanting the power of procreation; unable to copulate; also, sometimes, sterile; barren.
4)  n. - One who is imoitent.