il·le·gal 
(ĭ-lēgəl)
(ĭ-lēgəl)adj.
1. Prohibited by law.
2. Prohibited by official rules: an illegal pass in football.
3. Unacceptable to or not performable by a computer: an illegal operation.
n.
Offensive
Offensive
A person who is not legally authorized to live and work in a country.
il·legal·ly adv.