ABSTRACT
A famous claim made in 1903 by G.E.Moore was that goodness, in its primary sense, is a simple, unique, intrinsic and indefinable property, rather like yellow, only ‘nonnatural’—a term he never properly explained but which involves at least that goodness is not detectable by the senses or by scientific means, nor even by reason, but only by a sort of intuition; attempts to define it committed the ‘naturalistic fallacy’ (see NATURALISM).
