noun
breach of contract; nonfulfillment of a contract
Legal term for failure to perform contractual obligations.
契約不履行により損害賠償を請求された。
They were sued for damages due to breach of contract.
債務不履行 is a broader term for default on obligations, while 契約不履行 specifically refers to breach of a contract.
Compound of 契約 (contract) + 不履行 (non-performance).