deadpan(deliberately impassive or expressionless (as a face or look)) adjective [UK: ˈded.pæn] [US: ˈded.ˌpæn]His humour is very deadpan. = Su humor es muy inexpresivo.
expressionless(without expression) adjective [UK: ɪk.ˈspreʃn.ləs] [US: ɪk.ˌspre.ʃən.ləs]Making love to an expressionless woman is like sipping soup without any seasoning. = Hacer el amor con una mujer inexpresiva es como tomar la sopa sin ningún condimento.