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adjectival nouns or quasi-adjectives (keiyodoshi), noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru
busyness, a lot of things to do
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adjectival nouns or quasi-adjectives (keiyodoshi), noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru
frequent use, heavy use (of), many uses