be benighted; be ignorant and incapable (/incompetent); be wrapped in ignorance; have no real learning; ignoramus; lack knowledge and ability;not have (even) a smattering of knowledge; not study and know nothing; be unread; want of knowlege and ability; without (any)(real) learning (/knowledge)
❍ 最可恶是行里的同人背后骂我是个老胡涂，瞎了眼，叫一个～的三等货来做我的襄理。(曹禺《日出》)What is most detestable is when my colleagues in the bank call me a blind old fool behind my back because I get an uneducated third rater as my assistant.
不学无术
good for nothing;be ignorant and incompetent;have neither learning nor skill
不学无术bù xué wú shù
没有知识，没有本领。be ignorant and incompetent, have neither learning nor skill, ignorant and incapable