His apology, while welcome, felt like a feeble effort to mend the damage done.

feeble 是形容词，意思是"虚弱的、无力的"，常用来形容缺乏力量或效果的事物。这个词来自古法语，与拉丁语的"虚弱"概念相关。在句中形容道歉显得力度不足、效果微弱。