saturnine
(adjective)
adjective
1. having a tendency to be gloomy, bitter, and sarcastic.
- the face was saturnine and swarthy from sadness
Similar word(s): sarcastic
2. showing a brooding dark humor
- a saturnine young comedian
Similar word(s): dark, dour, glowering, glum, moody, morose, sour, sullen