to be ungrateful; to fail to appreciate someone's kindness or hospitality, especially when being favored or promoted by a superior

(idiom) to show no understanding of the times; to fail to adapt to current circumstances or trends; to be unable to recognize the current situation

To be insensitive to the situation; to fail to understand how to behave appropriately or when to stop, often by not knowing how to read the room or the attitudes of others.

unable to tell good from bad; undiscriminating or ungrateful. Used to describe someone who cannot distinguish right from wrong, or who fails to appreciate someone's good intentions or the seriousness of a situation.

(idiom) to be completely uneducated; lit. the eye cannot recognize the simple character [[丁|丁|ding1]]

Literally "not to know the true face of Lushan Mountain"; an idiom used to describe being unable to see the whole truth or the objective reality of a situation because one is too involved in it.

(idiom) literally "to have eyes but fail to recognize [[泰山|泰山|tai4 shan1]]"; used to apologize for being ignorant of someone's high status, great talent, or importance

not knowing even a single character; totally illiterate

to fail to grasp the larger issues or important principles; to focus on minor details while ignoring the general interest or rules of propriety

Han dynasty general known for his strict discipline and defense against the Xiongnu; he served under emperors Jing and Wu and was famously compared with contemporary general [[李广|李廣|li3 guang3]]

(idiom) unable to distinguish between high and low; unable to tell right from wrong or good from bad

To be unable to read or write; to be illiterate

Literally not knowing even the simple characters [[之|之|zhi1]] and [[无|無|wu2]]; used to describe someone who is illiterate or has no education.

not knowing a single character; unable to read or write

Describing a person who is totally illiterate or lacks even basic education, unable to recognize the simplest characters. Originally from the [[旧唐书|舊唐書|jiu4 tang2 shu1]], where it was noted that being able to pull a heavy bow is not as useful as recognizing the single character [[丁|丁|ding1]]

(idiom) to show no understanding of the current times; to be unable or unwilling to adapt to changing circumstances

(idiom) to fail to recognize a person of great importance or ability when meeting them face to face; literally "not to recognize Mt. Taishan"

to be a very poor judge of character; to fail to recognize a person's true worth or nature

Literally, do not fear not knowing the quality of goods, but only fear comparing them; it means that the true value of a person or object can only be determined through comparison with others.

a dog biting [[吕洞宾|呂洞賓|lu:3 dong4 bin1]]; to mistreat a person who is trying to help you or show you kindness

literally "don't worry about not being able to judge the quality of goods, only worry about comparing one item against another"; a proverb meaning that the true value of an object or person can only be determined through direct comparison

to fail to recognize the kindness or good intentions of others

(idiom) to be completely illiterate or uneducated