Ethical

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late Middle English (denoting ethics or moral philosophy; also used attributively): from Old French éthique, from Latin ethice, from Greek (hē) ēthikē (tekhnē) ‘(the science of) morals’, based on ēthos (see ethos).

wiktionary

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From ethic +‎ -al, from Late Latin ethicus(“moral, ethical”), from Ancient Greek ἠθικός(ēthikós, “of or for morals, moral, expressing character”), from ἦθος(êthos, “character, moral nature”).

etymonline

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ethical (adj.)

c. 1600, "pertaining to morality," from ethic + -al (1). Related: Ethicality; ethically.