na-adjective, noun
lack of virtue; immorality; vice; depravity; unworthiness
Refers to a deficiency in moral character or conduct. Often used in formal or literary contexts to describe personal failing or ethical shortcoming.
彼の不徳が招いた結果だ。
It is a result brought about by his lack of virtue.
政治家の不徳が批判されている。
The politician's immorality is being criticized.