Saturnine

/ˈsæt.ər.ˌnaɪn/ adjective hard

A saturnine person tends to be sullen, withdrawn, and slow to show warmth or cheer.

The saturnine professor rarely smiled, delivering even good news in the same flat, joyless tone.

Memory Trick

Saturnine comes from the planet Saturn, once thought by astrologers to make people born under it cold, slow, and gloomy.