noun
incompetent person; incapable person
General term for someone lacking ability or competence.
彼は無能力者ではないが、経験が足りない。
He is not an incompetent person, but he lacks experience.
noun
person without legal capacity
Legal term for someone who lacks the capacity to perform juridical acts, such as a minor or an adult under guardianship.
法律上、未成年者は無能力者とみなされる場合がある。
Under the law, minors may be regarded as persons without legal capacity.