illegal

非法的、违法的、不合法的

It is illegal to sell alcohol to anyone under eighteen.

把酒卖给未满十八岁的人是违法的。

违规的、犯规的

The referee ruled that the tackle was illegal.

裁判判定那次冲撞是犯规的。

无效的、不合规定的电脑

The program crashed after an illegal operation was detected.

程式在侦测到不合规定的操作后就当掉了。

非法移民贬义、歧视用语

Calling people illegals is widely considered offensive today.

现在把人称为非法移民普遍被认为带有歧视意味。