tristĭtūdo — Lewis & Short
tristĭtūdo, ĭnis, f.id.,
I sadness, sorrow, grief, melancholy, dejection (post-class.):
omnem de tuo pectore tristitudinem mitte,App. M. 3, p. 134; so id. Mag. p. 295, 19; Sid. Ep. 8, 11 fin.