Meaning of wú zhī:
wú zhī
无知
Adjective
ignorant
Tā duì zhège huàtí fēicháng wúzhī.
他对这个话题非常无知。
He is very ignorant about this topic.
Noun
ignorance
Tā de juédìng xiǎnrán shì jīyú tā de wúzhī.
他的决定显然是基于他的无知。
His decision was obviously based on his ignorance.