This is the 505th most frequent Chinese word.
非法
Illegal.
In this sentence, '非法' is used as an adjective describing the nature of the transactions.
他因从事非法交易而被捕。
He was arrested for engaging in illegal transactions.
Here, '非法' serves as part of a predicate indicating the legality of behavior under legal jurisdiction.
这种行为被法律明确规定为非法。
This behavior is explicitly defined as illegal by law.
In this example, '非法' describes the immigration status, emphasizing the adjective role related to a noun (immigration).