saturnine (adj.)

• black
• bleak
• crabbed
• dark
• dismal
• dour
• drear
• dreary
• funereal
• gloomy
• glum
• grave
• gray
• grim
• morose
• reserved
• serious
• silent
• solemn
• somber
• staid
• sulky
• surly
• taciturn
• ugly
• uncommunicative
• wearisome
• weary