The Collaborative International Dictionary of English v.0.48:
Unpitious \Un*pi"tious\, a. 1. Impious; wicked. [Obs.] "The life of the unpitous." --Wyclif (Prov. xv. 8). [1913 Webster] 2. Destitute of pity; pitiless. [Obs.] --Chaucer. [1913 Webster] -- Un*pi"tous*ly, adv. [Obs.] -- Un*pi"tous*ness, n. [Obs.] --Wyclif. [1913 Webster]