Jisho

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Adverb (fukushi)
1. suddenly (appear, stick out); abruptly; unexpectedly; looming (e.g. out of the dark)Onomatopoeic or mimetic word, ぬうっと is less abrupt
Adverb (fukushi)
2. (stand) still and expressionless; imposinglyOnomatopoeic or mimetic word
Adverb (fukushi)
3. suddenly (stand up)Onomatopoeic or mimetic word, Only applies to ぬっと
Other forms
ぬっとぬうっとのっとにょっと
Notes
のっと: Out-dated or obsolete kana usage. にょっと: Out-dated or obsolete kana usage.

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