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adjectival nouns or quasi-adjectives (keiyodoshi)
agile, nimble, light (of foot)
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捕らえることのできないもの、身軽で素早いもののたとえ、だそうです。
It's apparently a metaphor for something uncatchable, light of body and fleet of foot.
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adjectival nouns or quasi-adjectives (keiyodoshi)
casual (clothing), light (e.g. luggage)
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adjectival nouns or quasi-adjectives (keiyodoshi)
carefree, with limited responsibility