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adjectival nouns or quasi-adjectives (keiyodoshi), noun (common) (futsuumeishi)
apathetic, lackadaisical, indolent, listless, weak-willed, languid
formal or literary term -
adjectival nouns or quasi-adjectives (keiyodoshi), noun (common) (futsuumeishi)
weak, feeble, effeminate, enervated, effete
formal or literary term