- illegal, unlawful
- These words mean "contrary to statutes and regulations," "not legal." Illegal is restricted to these meanings, but unlawful, a more general term, is also applied to acts that are not only against the law but generally unauthorized or unacceptable. That is, something unlawful may go against not only the law but also moral standards; a synonym for unlawful is illicit. For example, gambling is not illegal in some states, but in every state some persons consider it unlawful. An unlawful act may or may not be illegal, but it is always "not approved," "not sanctioned." See also illicit.
Dictionary of problem words and expressions. Harry Shaw. 1975.