不知好歹 Ungrateful
Explanation
不知道好坏。多指不能领会别人的好意。
Doesn't know good from bad. Often refers to the inability to understand the good intentions of others.
Origin Story
从前，有个农夫辛辛苦苦种了一年的田，终于收获满满。他把最好的粮食送给村里一位德高望重的老人，老人非常高兴，又送给他一些自己酿的米酒。农夫回到家，妻子却抱怨说：“那些粮食是咱们一年的辛苦，白送给别人了！那酒也不好喝，还不如自家酿的！”农夫叹了口气，妻子不知好歹，不懂得感恩。后来，农夫家遭遇了灾难，老人却慷慨相助，妻子才后悔当初不知好歹。
Once upon a time, a farmer worked hard for a year and finally harvested a great deal. He gave his best grain to an old man respected in the village. The old man was very happy and gave him some homemade rice wine in return. When the farmer returned home, his wife complained, "That grain was our hard work for a year, and we gave it away for nothing! That wine isn't even good, it's not as good as the one we make ourselves!" The farmer sighed; his wife didn't know good from bad and didn't understand gratitude. Later, the farmer's family suffered a disaster, but the old man helped them generously, and the wife regretted her ungratefulness.
Usage
用于形容一个人不识好歹，不懂感恩，不领会别人的好意。多用于口语中。
Used to describe someone who doesn't know good from bad, doesn't appreciate favors, and doesn't understand the good intentions of others. Mostly used in spoken language.
Examples
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他如此不知好歹，真是令人气愤！
tā rúcǐ bù zhī hǎo dǎi, zhēnshi lìng rén qìfèn!
He is so ungrateful, it's infuriating!
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面对领导的帮助，他竟然不知好歹，真是让人失望！
miàn duì lǐng dǎo de bāngzhù, tā jìngrán bù zhī hǎo dǎi, zhēnshi ràng rén shīwàng!
He is so ungrateful for his boss's help, it is really disappointing!