lack of knowledge
I don't know anything. Idioms, as predicates and attributives, lack of metaphorical knowledge. It's the same thing. Source of "Southern history · recluse biography · Tao Hongjing": "read more than ten thousand volumes, do not know anything, think deep shame."
The origin of Idioms
Tao Hongjing, a reclusive biography of the southern history, said: "if you read more than ten thousand volumes and don't know anything, you will be deeply ashamed."
Idiom usage
It refers to incomplete knowledge
Discrimination of words
I don't know a synonym
lack of knowledge
one 's lips are dry and one 's mouth parched - chún gān kǒu zào