Unlawful, a.
Not lawful; contrary to law. -- Un*law"ful*ly, adv. -- Un*law"ful*ness, n. Unlawful assembly. (Law) See under Assembly.
Shades of meaning
Fernald has no entry of its own for unlawful; he lists it under criminal.
Where he writes about it:
Every criminal act is illegal or unlawful, but illegal or unlawful acts may not be criminal. — from criminal
Offenses against public law are criminal; offenses against private rights are merely illegal or unlawful. — from criminal