na-adjective, noun
impossible; incapable; unable
Describes a state where something cannot be done or is not feasible. Often used in formal or written contexts.
この問題は解決不能だ。
This problem is impossible to solve.
彼はその仕事をすることが不能だった。
He was incapable of doing that job.
noun
Refers to a lack of ability or skill, often as a personal or organizational shortcoming.
彼の不能がプロジェクトの失敗を招いた。
His incompetence led to the project's failure.
noun
Medical/physiological term for erectile dysfunction. Often replaced by the loanword インポテンツ in modern usage.
See also: インポテンツ
不能の治療には様々な方法がある。
There are various treatments for impotence.
noun
having no solution
Mathematics term for an equation or problem that cannot be solved.
この方程式は不能であることが証明された。
It was proven that this equation has no solution.