1. Bitter or scornful
   "the face was saturnine and swarthy, and the sensual lips...twisted with disdain" 
2. Showing a brooding ill humour
   "a saturnine, almost misanthropic young genius"
   - dark, dour, glowering, glum, moody, morose, sour, sullen

See also: ill-natured, sarcastic

• Monothelitism
• monotone
• monotonic
• monotonous
• monotonously
• monotonousness
• monotony
• Monotremata
• monotreme
• Monotropa
• Monotropa hypopithys
• Monotropa uniflora
• Monotropaceae
• monotype
• monotypic
• monounsaturated
• monounsaturated fatty acid
• monovalent
• monovular
• monoxide
• monozygotic
• monozygotic twin
• monozygous twin
• Monro's foramen
• Monroe