You can define 'good' any way you like — the question stays open

G.E. Moore argued that whatever you say 'good' means — pleasurable, natural, evolved — you can always still meaningfully ask 'but is that actually good?' Because the question never closes, Moore concluded 'good' can't be the same thing as any natural property. He called the opposite assumption the naturalistic fallacy, reshaping 20th-century ethics.

— G. E. Moore, Principia Ethica — 1903, Chapter 1
Go deeper: get the book →