老衰ろうすい Common Noun Irregular Intransitive Noun English jmdict 1 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verbnouns which may take the genitive case particle 'no' senility;senile decay;infirmity (through age) 彼は老衰で二年前に亡くなった。 He died of old age two years ago.
Shirabe