Dehonest Share definition Flag adj. The discovery that an apparent truth was in fact a lie. Not to be confused with being Dionest. "Dan told me that drinks were going to be £1 all night just so I would invite loads of people. Turns out the drinks are £2 - I feel so dehonest!" Dehonest by Mr. Duffy October 9, 2008 0 0 Get merch Get the Dehonest mug. Buy Now — $32.95 See more merch