unenlightened; profoundly ignorant
A yojijukugo describing a state of deep ignorance and lack of wisdom. Often used in formal or literary contexts to criticize someone's lack of knowledge or enlightenment.
I was shocked by his unenlightened remarks.
You should avoid behavior that exposes your profound ignorance.
無知 means simple ignorance or lack of knowledge, while 無知愚昧 emphasizes a deeper, almost willful ignorance and lack of wisdom.
愚昧 alone means foolishness or stupidity; 無知愚昧 combines it with 無知 to stress both ignorance and foolishness.
A yojijukugo composed of 無知 (ignorance) and 愚昧 (foolishness). The exact historical derivation is uncertain, but it follows the common pattern of combining two two-character compounds to intensify the meaning.