鉄面皮 - JP-EN Jisho

鉄(てつ)面(めん)皮(ぴ)

noun (common) (futsuumeishi)adjectival nouns or quasi-adjectives (keiyodoshi)nouns which may take the genitive case particle 'no'

impudence; shamelessness; brazenness; arrogance; audacity; effrontery; nerve