noun
impossibility of performance; unenforceability
Legal term referring to a situation where a contractual obligation cannot be performed, making it unenforceable.
履行不能の場合、契約は解除されることがある。
In cases of impossibility of performance, the contract may be rescinded.
Compound of 履行 (rikō, 'performance') and 不能 (funō, 'impossibility').