Immoral, a.
Etymology: [Pref. im- not + moral: cf. F. immoral.]
Not moral; inconsistent with rectitude, purity, or good morals; contrary to conscience or the divine law; wicked; unjust; dishonest; vicious; licentious; as, an immoral man; an immoral deed.
Syn. -- Wicked; sinful; criminal; vicious; unjust; dishonest; depraved; impure; unchaste; profligate; dissolute; abandoned; licentious; lewd; obscene.
Shades of meaning
Fernald has no entry of its own for immoral; he lists it under criminal.
He lists it without comment; the entries above explain its neighbors.