MOST of us feel an aversion to lying and believe that it always stands in need of justification. One expression of this is to say that there is a prima facie duty not to lie. Another is Sissela Bok's "Principle of Veracity" which holds that lying has an "initial negative weight" so that there is always a presumption against telling a particular lie. Still a third variation can be found in Arnold Isenberg's "constancy principle" which holds that what is inherently (...) bad in any lie is the same for all, constant from one lie to the next. While these sorts of view are plausible, the literature on lying provides little in the way of a specific account for the negative weight inherent in all lies--their common disvalue. What follows is proposed as such an account, one which should also help clarify why some lies are worse than others, why some are excusable and others justifiable. Without presuming to be exhaustive, the view offered maintains that there are at least two inherent negative components of all lies; further, each of these inherent disvalues disposes the liar toward a particular, contingent harm. The inherent disvalues and the harms they threaten collectively constitute sufficient grounds for the presumption against lying. (shrink)