1
flat and smooth
2
unchanging;featureless;expressionless;monotonous
3
noppera-bō;humanoid creature with a flat, featureless face
Other forms
野箆坊 【のっぺらぼう】 (search-only kanji form) · 野篦坊 【のっぺらぼう】 (search-only kanji form)