別 無 bié wú : have no other (choice, alternative, etc)

不 得 不 bù dé bù : have no choice or option but to; cannot but; have to; can't help it; can't avoid

不 得 已 bù dé yǐ : act against one's will; have no alternative but to; have to; to have no choice; must

迫 不 得 已 pò bù dé yǐ : have no choice; compelled

選 擇 xuǎn zé : to select; to pick; to choose; to make a choice