Impossibility - Wikipedia In contract law, impossibility is an excuse for the nonperformance of duties under a contract, based on a change in circumstances (or the discovery of.. b While the British defense of Crete in May 1941 was considered a military failure, it altered Hitler’s future tactics. Miracles. The term "miracle" is used very broadly in ordinary language. A quick review of news stories may turn up reports such as that of a "Christmas.