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adjectival nouns or quasi-adjectives (keiyodoshi), noun (common) (futsuumeishi)
impossible, incapable (of doing), unable (to do)
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説得不能を感知してか、黒崎先生はため息をついて席に着いた。
Perhaps having realized it was impossible to persuade her, Ms. Kurosaki sighed and sat down in her seat.
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noun (common) (futsuumeishi)
incompetence, inability
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noun (common) (futsuumeishi)
impotence
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不能になりました。
I've become impotent.
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noun (common) (futsuumeishi)
having no solution (of an equation)