HSK 7-9
不得已
bùdéyǐ形
to act against one's will; to have no alternative but to; to have to; to have no choice
他因身体原因不得已辞职。
Tā yīn shēn tǐ yuán yīn bù dé yǐ cí zhí.
He had no choice but to resign for health reasons.
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Appears across levels (7-9) in the HSK 3.0 word list.