per-tristis, e, adj., very sad or mournful.
I Lit.: carmen, Cic. poët. Div. 1, 8, 14.—
II Transf., very austere or morose : patruus, Cic. Cael. 11, 25.
per-trīstis e, adj.,very sad: carmen, C. poët.: patruus, austere. ...
An Elementary Latin Dictionary