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noun or participle which takes the aux. verb suru, intransitive verb, noun (common) (futsuumeishi), adjectival nouns or quasi-adjectives (keiyodoshi)
to be stumped, to be at a loss, to be at one's wits' end, to be nonplussed
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彼はその問題で閉口していた。
He was stumped by the problem.
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noun or participle which takes the aux. verb suru, intransitive verb, noun (common) (futsuumeishi), adjectival nouns or quasi-adjectives (keiyodoshi)
to be fed up, to be tired (of), to be unable to bear, to be annoyed
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君のわがままには閉口する。
I'm annoyed at your selfishness.
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