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adjectival nouns or quasi-adjectives (keiyodoshi), noun (common) (futsuumeishi)
wonderful, marvelous, strange, incredible, amazing, curious, miraculous, mysterious
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この刀には不思議ないわれがある。
This sword has a strange history.
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adverb taking the 'to' particle
strangely enough, oddly enough, for some reason, curiously