tristĭcŭlus, a, um, adj. dim. [tristis],
somewhat sorrowful , rather sad : filiola, * Cic. Div. 1, 46, 103; M. Aur. ap. Front. Ep. 3, 17.
trīsticulus adj. dim. tristis, somewhat sorrowful, downcast : filiola. ...
An Elementary Latin Dictionary