impotent
im-po-tent
adjective
Lacking power, strength, or ability to act effectively or influence events.
"The villagers felt impotent against the flood."
adjective
(Of a man) unable to achieve or maintain an erection for sexual intercourse.
"He was diagnosed as medically impotent."
Thesaurus
Synonyms: impuissant, effete, ineffective, ineffectual, unable