"The delay was caused by poor communication, not lack of effort." - "Precisely."

precisely 是形容词 precise（精确的）的副词形式，意思是"准确地、确切地"。在这里用作回应语，表示完全同意对方的说法，相当于汉语中的"正是如此""确实如此"。 precisely 由词根 precis（精确）和后缀 -ly（构成副词）组成。