a.
1.
Powerless, unable, incapable, incompetent, disabled, incapacitated, imbecile, weak, feeble, infirm, frail, inefficient.
2.
Unable to procreate, incapable of begetting offspring.
IMPOTENT
Meaning of IMPOTENT in English
Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012