sneakiness|ˈsniːkɪnɪs| [f. sneaky a.] The character or quality of being sneaky. 1859Boyd Recreat. Country Parson (1862) 63 Sneakiness..is worse than the most indiscreet honesty.1865― Crit.Ess. (1867) 3 His sneakiness as a patriot, his corruption as a judge.