 Ross suggests a number of arguments against various (naturalistic and non-naturalistic) definitions of moral terms. He relies in part on the following kind of argument, which is directed at Moore (RG 8). If ‘right’ and ‘being productive of the greatest good in the circumstances’ mean the same thing, it is not the case it is intelligible the proposition ‘the “right act” just is “the act productive of the greatest good in the circumstances”’ should have been denied and maintained ‘with so much fervour; for we do not fight for or against analytic propositions’ (RG 8). It is intelligible that these propositions should have been denied and maintained with so much fervour. Therefore, it is not the case that ‘right’ and ‘productive of the greatest good in the circumstances’ mean the same thing. This argument can be generalised to reject the usual suspects, e.g., ‘right’ means ‘approved of by me’ or ‘right’ means ‘approved of by the majority of society’, and so on. But it is not the best argument, since we may well fight over analytic propositions, especially when they are opaque or unobvious.