Illegal
Unlawful
noun, な adjective, の adjective
A not law is something that's against the law. It's illegal or unlawful.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
不法な事
wrongdoing
不法な要求
unlawful request
不法な目的
unlawful purpose
不法にアクセスする
to access illegally
不法に入国する
to enter a country illegally
不法に入手する
to obtain illegally
不法サイト
illegal website
不法入国
illegal immigration, illegally enter a country
不法ビジネス
illegal business
それって不法コピーじゃないの？
Isn't that an illegal copy?
その人、不法なビジネスをやってるってウワサなんで、近づかない方がいいですよ。
There's a rumor that person is involved in illegal business, so it's better to stay away from them.
その男は、マシンガンやドラッグを不法に売買しようとしていました。
That man was attempting to illegally buy and sell machine guns and drugs.