불법적

불법적

"Illegal" or "unlawful."

Here, '불법적' is used as an adjective to describe the action as being against the law.

그 행동은 불법적입니다.

That action is illegal.

In this sentence, '불법적' modifies '거래' to indicate that the type of trading being referred to involves illegal activities.

불법적인 거래는 위험합니다.

Illegal trading is dangerous.

Here, the word '불법적' is converted into an adverb '불법적으로' to describe the manner in which the document was obtained.

그는 불법적으로 그 문서를 입수했습니다.

He obtained the document illegally.