adj.不屈不撓的；不松懈的
This time the chase would be long and hard and unrelenting. 這一次的追蹤將是長期的、艱難的、不屈不撓的。
Her unrelenting efforts made the project a success. 她堅持不懈地努力使計劃獲得了成功。
adv.無情地
