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

• family Sarraceniaceae
• family Saturniidae
• family Satyridae
• family Saururaceae
• family Saxifragaceae
• family Scarabaeidae
• family Scaridae
• family Scheuchzeriaceae
• family Schistosomatidae
• family Schizaeaceae
• family Schizophyceae
• family Schizosaccharomycetaceae
• family Sciadopityaceae
• family Sciaenidae
• family Sciaridae
• family Scincidae
• family Sciuridae
• family Sclerodermataceae
• family Sclerotiniaceae
• family Scolopacidae
• family Scolytidae
• family Scomberesocidae
• family Scombresocidae
• family Scombridae
• family Scorpaenidae