Illegal, Unlawful
noun, な adjective, の adjective
A not law is something that's against the law. It's illegal or unlawful.
ふほう
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.
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.