違法 is read as いほう (ihou) and means illegal.
いほう
ihou
いほうせい
illegality
いほうしょじ
illegal possession
いほうこぴー
illegal copy
いほうどらっぐ
law-evading drug (e.g. amyl nitrates, MiPT)
いほうだうんろーど
illegal downloading (e.g. of copyrighted works)
いほうやくぶつ
illegal drug
いほうしゃ
lawbreaker
いけんりっぽうしんさけん
power of judicial review
いほうこうい
illegal act
いほうそうぎょう
illegal fishing
いほうせいそきゃくじゆう
justifiable cause for noncompliance with the law
いほうかいぞう
illegal tuning (of cars, motorcycles, etc)