万不得已 (wàn bù dé yǐ) | Meaning: only when absolutely essential (idiom); as a last resort | Chinese Idiom with Pinyin & Origin

have no way out · have no alternative · abbr. to wú nài无可奈何wú kě nài hé

to have no alternative (idiom); compelled by circumstances · forced into sth迫不得已pò bù dé yǐ

to have no alternative · frustrated · exasperated · helpless · (conjunction) but unfortunately无奈wú nài

only when absolutely essential (idiom); as a last resort