impotent

adjectives

lacking power or ability
"Technology without morality is barbarous; morality without technology is impotent"- Freeman J.Dyson; "felt impotent rage"
impotent
is derived from
impotency
is derived from
impotence
antonym
potent
is similar to
lacking in power or forcefulness
"an ineffectual ruler"; "like an unable phoenix in hot ashes"
ineffective, ineffectual, unable
is similar to
lacking physical strength or vigor
impuissant
see also
incapable of reproducing
"an infertile couple"
infertile, sterile, unfertile
see also
lacking power
powerless
is an attribute of
capacity to produce strong physiological or chemical effects
"the toxin's potency"; "the strength of the drinks"
effectiveness, potency, strength
(of a male) unable to copulate
impotent
is derived from
impotency
is derived from
impotence
antonym
potent