Merriam-Webster Collegiate Dictionary - ethical

 also ethic  adjective  Etymology: Middle English etik, from Latin ethicus, from Greek ethikos, from ethos character — more at sib  Date: 1588  1. of or relating to ethics ~ theories  2. involving or expressing moral approval or disapproval ~ judgments  3. conforming to accepted standards of conduct ~ behavior  4. of a drug restricted to sale only on a doctor's prescription  Synonyms: see moral  • ~ity noun  • ~ly adverb  • ~ness noun