ものしらず
stupidity; ignorance; stupid person; ignorant person
Also written 物知らず、物識らず、モノ知らず、物しらず
Noun, No-adjective
恐こわいもの知しらずのその男おとこは憎にくしみと軽蔑けいべつの目めでやくざをちらりと見みた。
The bold man glanced at the gangster with hatred and contempt.