failedEnglishOxford Dictionary of Englishfailed /feɪld / ▸ adjective [attributive] 1 (of an undertaking or a relationship) not achieving its end or not lasting; unsuccessful: a failed coup attempt. ▪ (of a person) unsuccessful in a particular activity: a failed writer. ▪ (of a business) unable to continue owing to financial difficulties: a failed transport company. 2 (of a mechanism) not functioning properly: an aircraft with a failed engine.