tristitudo

tristĭtūdo, ĭnis, f. [tristis],

• sadness, sorrow, grief, melancholy, dejection (post-class.): omnem de tuo pectore tristitudinem mitte, Ap. Met. 3, 11, 8; so id. Mag. p. 295, 19; Sid. Ep. 8, 11 fin.