saturnine

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having the temperament of one born under the supposed astrological influence of Saturn.
• adjective Melancholy or sullen.
• adjective Having or marked by a tendency to be bitter or sardonic.
• adjective Produced by absorption of lead.

from The Century Dictionary.

• Pertaining to the god Saturn or the planet Saturn; under the influence of the planet Saturn.
• [lowercase] Morose; dull; heavy; grave; not readily susceptible to excitement or cheerfulness; phlegmatic.
• [lowercase] Arousing no interest; stupid; dull; uninteresting.
• [lowercase] In old chemistry, pertaining to lead: as, saturnine compounds.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Born under, or influenced by, the planet Saturn.
• adjective Heavy; grave; gloomy; dull; -- the opposite of mercurial.
• adjective (Old Chem.), Archaic Of or pertaining to lead; characterized by, or resembling, lead, which was formerly called Saturn.
• adjective (Med.) lead colic.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective of or born under Saturn's influence
• adjective containing lead, or suffering from lead poisoning (saturnia)
• adjective cold and slow to change and react (refers to mood)
• adjective gloomy, depressed, dull
• adjective sardonic, bitter, disdainful

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective bitter or scornful
• adjective showing a brooding ill humor