This is the 5064th most frequent Japanese word.
複雑
Complex; complicated.
Here, "複雑" describes the nuanced and intricate nature of emotions, emphasizing its abstract usage.
彼の感情が複雑なのは普通のことです。
It's normal for his emotions to be complex.
In this example, "複雑" refers to the intricate and detailed design or structure of the machine's mechanism.
この機械の仕組みは複雑で理解するのが難しいです。
The mechanism of this machine is complex and difficult to understand.
In this sentence, the word "複雑" is used as an adjective to describe the problem as being complicated or intricate.