He handled the client's issue in a very business-like manner.

business-like 是由名词 business（商业、事务）加上后缀 -like（像...的）构成的形容词，意思是"像商业事务那样正式的、有效率的、不带个人感情的"。business-like manner 指"公事公办的态度或方式"。