违约责任是指当一方在合同中未履行其应尽的义务，导致合同无法达成目的或者造成损失时，另一方可以要求其承担相应的法律责任。这种责任通常是指违约方需要向另一方赔偿损失或者承担其他补救措施。

How to read: wéi yuē zé rèn

用法：违约责任是在签订合同时约定的，双方必须遵守并履行。如果一方未能履行自己的义务，另一方可以要求其承担违约责任。

例句1：如果买卖双方都没有按照合同规定的时间交付货物，就会产生违约责任。

Sentence 1: If both the buyer and seller fail to deliver the goods within the time specified in the contract, it will result in breach of contract.

例句2：根据合同规定，如果甲方未能按时支付货款，乙方有权要求甲方承担违约责任。

Sentence 2: According to the contract, if Party A fails to pay for the goods on time, Party B has the right to demand compensation for breach of contract.

例句3：在签订租赁合同时，房东和租客都要明确各自的违约责任。

Sentence 3: When signing a lease agreement, both the landlord and tenant need to clearly define their respective responsibilities for breach of contract.

例句4：如果违约责任没有明确规定，法律会根据合同的性质和情况来确定。

Sentence 4: If the liability for breach of contract is not clearly defined, the law will determine it based on the nature and circumstances of the contract.

例句5：双方应当诚信履行合同义务，避免产生违约责任。

Sentence 5: Both parties should fulfill their contractual obligations in good faith to avoid any liability for breach of contract.

同义词及用法：违约责任可以与“违约赔偿”、“违约金”、“违约金”等同义词替换使用。

Synonyms and usage: Breach of contract can be replaced with synonyms such as "compensation for breach", "liquidated damages", or "penalty for breach".

编辑总结：违约责任是在合同中规定的一方未能履行其应尽的义务时需要承担的法律责任。双方在签订合同时应当明确各自的责任，以避免产生纠纷。如果发生违约，另一方可以要求赔偿损失或者采取其他补救措施。为了避免不必要的麻烦，建议在签订合同时对违约责任进行明确规定。