IPA: /ˈsætərnaɪn/
KK: /ˈsætərˌnaɪn/
Having a gloomy or sullen temperament; often associated with bitterness or melancholy.
His saturnine demeanor made it hard for others to approach him.
Saturnine is derived from "Saturnus" (the Roman god of agriculture and time, often associated with melancholy) and the suffix "-ine" (meaning pertaining to or of the nature of). The word describes a temperament that is gloomy or sullen, reflecting the characteristics attributed to the god Saturn.
Think of the Roman god Saturn, who is often linked to feelings of gloom and melancholy, to remember that 'saturnine' describes a gloomy or sullen disposition.