Noun, Noun which may take the genitive case particle 'no'

not wearing a mask (in kendo, noh, etc.)

sober face

see 素面see しらふ・2

sobriety

see 素面see しらふ・1

Noun, Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no'

face with no make-up; unpainted face

Archaicsee 素顔see すがお・1