From Longman Dictionary of Contemporary Englishpo-facedpo-faced /ˌpəʊ ˈfeɪst◂ $ ˌpoʊ-/ adjective British English informal UNFRIENDLYhaving an unfriendly disapproving expression on your face SYN stern
Examples from the Corpus
po-faced• Their smiles were like a knowing wink: sussed and street-wise without being in the least dour or po-faced.• And she added something po-faced about toleration and talent.• It was really slow and a bit po-faced for me.• Jenkins was at his most po-faced here.• Let's hope advertisers get the message and give us more laughs and less po-faced hype in future.• The writer's po-faced style occasionally irritates: do people really need reminding that cases of bubonic plague should be treated immediately?• And if that sounds a bit po-faced, then you're missing the point.Origin po-faced (1900-2000) Perhaps from po “chamber pot” ((19-20 centuries)), from French pot, influenced by poker-faced 