のっぺらぼう
のっぺらぽう
ぬっぺらぼう
adjectival nouns or quasi-adjectives (keiyodoshi)
nouns which may take the genitive case particle `no'
smooth
flat
lacking bumps and dents
featureless
uneventful
noun (common) (futsuumeishi)
mythical being with flat featureless face
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