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adjectival nouns or quasi-adjectives (keiyodoshi), noun (common) (futsuumeishi)
lively, vigorous, energetic, healthy, avid (e.g. desire), rich (e.g. imagination)
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彼は知識欲が旺盛である。
He is in a rage to know.
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noun, used as a suffix, adjectival nouns or quasi-adjectives (keiyodoshi)
full of (energy, appetite, curiosity, etc.), brimming with