HSK 7-9
固执
gùzhi形
obstinate; stubborn; to fixate on; to cling to
父亲太固执不肯改变主意。
Fù qīn tài gù zhi bù kěn gǎi biàn zhǔ yi.
My father is too stubborn to change his mind.
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Appears across levels (7-9) in the HSK 3.0 word list.