Open Question Argument｜開放問題論證：就算「好」被等同某個自然性質，問「但它真的好嗎？」似乎仍不是廢話

G. E. Moore’s open question argument challenges simple naturalistic definitions of moral goodness. If 'good' were analytically identical with a natural property, Moore argued, then asking whether something with that property is really good should be closed or trivial; yet the question appears to remain intelligible.

後來的 naturalist metaethics 對 Moore 的論證有多種回應；open-question intuition 不是被所有哲學家接受為對自然主義的決定性反駁。