His unconventional approach to problem-solving made him a valuable asset in the innovative tech company.

unconventional 是由前缀 un-（表示"不、非"）和 conventional（"传统的、常规的"）组成的形容词。conventional 来自 convention（"惯例、习俗"），所以 unconventional 字面意思是"不符合惯例的"，即"非常规的、非传统的"。