What does "saturnine" mean?

Saturnine: Heavy; grave; gloomy; dull; -- the opposite of mercurial; as, a saturnine person or temper. Addison.

Additional senses

  1. 2.(Old Chem.) Of or pertaining to lead; characterized by, or resembling, lead, which was formerly called Saturn. [Archaic] Saturnine colic (Med.), lead colic.

Sources