Source : Webster's Revised Unabridged Dictionary (1913)

Saturnine \Sat"ur*nine\, a. [L. Saturnus the god Saturn, also,
   the planet Saturn: cf. F. saturnin of or pertaining to lead
   (Saturn, in old chemistry, meaning lead), saturnien
   saturnine, saturnian. See {Saturn}.]
   1. Born under, or influenced by, the planet Saturn.

   2. Heavy; grave; gloomy; dull; -- the opposite of
      {mercurial}; as, a saturnine person or temper. --Addison.

   3. (Old Chem.) Of or pertaining to lead; characterized by, or
      resembling, lead, which was formerly called Saturn.
      [Archaic]

   {Saturnine colic} (Med.), lead colic.

Source : WordNet®

saturnine
     adj 1: bitter or scornful; "the face was saturnine and swarthy, and
            the sensual lips...twisted with disdain"- Oscar Wilde
     2: showing a brooding ill humor; "a dark scowl"; "the
        proverbially dour New England Puritan"; "a glum, hopeless
        shrug"; "he sat in moody silence"; "a morose and
        unsociable manner"; "a saturnine, almost misanthropic
        young genius"- Bruce Bliven; "a sour temper"; "a sullen
        crowd" [syn: {dark}, {dour}, {glowering}, {glum}, {moody},
         {morose}, {sour}, {sullen}]