迫不得已

Explanation: There is no way to be forced, have to do. 　　Usage: Partial official; as predicate, object, attribute; that reluctance 　　Source: Han Ban "on the Biography of Wang Mang Han": "Princess for the _set_ting of the emperor, the Yousi on the name, the public woman-led, public deep politely refuse, compelling, and Shou Zhao." 　　Examples: He did so, totally ~. Thesaurus:  unexpected happenings, a treaty signed under coercion, doings ofghosts and gods— — unexpected happenings, Angel Ghost severance, body Cannot but main, all sorts of have no choice, flowers will die,do what one may, by absolute necessity