我行我素

wǒ xíng wǒ sù

to go one’s own way regardless

Character by character

我wǒ
I

行xíng
act

我wǒ
my

素sù
usual

不管别人怎么说，她依然我行我素。

Whatever anyone says, she carries on doing her own thing.

Tone: neutral.

Can be admiring (independent) or critical (won’t listen); 行 is xíng.

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