Full Idea
A term is moral because of the power that the word acquires, on account of its history in emotional situations, to evoke or directly express attitudes, as distinct from describing or designating them.
Gist of Idea
Moral words have an inherited power from expressing attitudes in emotional situations
Source
Charles Leslie Stevenson (Ethics and Language [1944], p.33), quoted by John Hacker-Wright - Philippa Foot's Moral Thought 1 'Ayer'
Book Reference
Hacker-Wright,John: 'Philippa Foot's Moral Thought' [Bloomsbury 2013], p.16
A Reaction
Invites the question of what the words meant before they acquired this patina of historical usage. If 'good' orginally meant 'hurray!', its repeated usage doesn't seem to change that. If it was descriptive, why would that change with time?