ETHICAL (adj)

1. pertaining to or dealing with morals or the principles of morality; pertaining to right and wrong in conduct.
2. being in accordance with the rules or standards for right conduct or practice, esp. the standards of a profession: It was not considered ethical for physicians to advertise.
3. (of drugs) sold only upon medical prescription.
—Syn.2. moral, upright, honest, righteous, virtuous, honorable.
—Ant.2. immoral.

* Excerpted from the Random House Webster's Unabridged Dictionary 3.0.