illiterate and ignorant; uneducated and uninformed
A yojijukugo describing someone who lacks both formal learning and worldly knowledge. Often used critically or self-deprecatingly.
He is uneducated and ignorant, but has a wealth of experience.
I'm ashamed of my own ignorance and lack of education.
無学 means 'uneducated' or 'illiterate', focusing on lack of formal learning, whereas 無学無知 adds the dimension of general ignorance.
A yojijukugo combining 無学 (no learning) and 無知 (no knowledge). The exact origin is uncertain, but it follows a common pattern of pairing synonymous or complementary terms for emphasis.