Gloat (?), v. i. [imp. & p. p. Gloated; p. pr. & vb. n. Gloating.] [Akin to Icel. glotta to smile scornfully, G. glotzen to gloat.] To look steadfastly; to gaze earnestly; to gaze with passionate desire, lust, or avarice.[1913 Webster]
2. To gaze with malignant satisfaction; to exult maliciously, sometimes also triumphantly, in another's loss or discomfort; -- usually in a bad sense.[1913 Webster]
In vengeance gloating on another's pain.