Against the law; forbidden by law. / Guilty of breaking the law. / Of or relating to crime or penal law. / (figuratively) Abhorrent or very undesirable.

A person who is guilty of a crime, notably breaking the law.

The act of making a previously legal activity illegal, the act of making something a criminal offence. / The act of turning someone into a criminal by making their activities illegal.

plural of criminal

(transitive) To make (something) a crime; to make illegal under criminal law; to ban. / (transitive) To treat as a criminal.

(uncountable) The state of being criminal. / (uncountable) Criminal activity. / (countable) A criminal act.

In a criminal manner.

(rare, dated) The state or quality of being criminal.

present participle of criminalize

simple past tense and past participle of criminalize