not potent; lacking power or ability.

utterly unable (to do something).

without force or effectiveness.

lacking bodily strength or physically helpless.

(of a male) unable to attain or sustain a penile erection.

(esp. of a male) sterile.

Obsolete . without restraint.

an impotent person

therapy for sexual impotents.

adjective

able , capable , fertile , potent , productive , strong

adjective

barren , crippled , dud , effete , enervated , enfeebled , feeble , forceless , frail , gutless , helpless , inadequate , incapable , incapacitated , incompetent , ineffective , ineffectual , inept , infecund , infirm , nerveless , paper tiger * , paralyzed , powerless , prostrate , sterile , unfruitful , unproductive , weak , childless , infertile