1. Dark and dismal as of the rivers Acheron and Styx in Hades
   - Acheronian, Stygian

See also: dark

• luminous intensity unit
• luminously
• luminousness
• lummox
• lump
• lump sugar
• lump sum
• lumpectomy
• lumpen
• lumpenproletariat
• Lumpenus
• Lumpenus lumpretaeformis
• lumper
• lumpfish
• lumpish
• lumpsucker
• lumpy
• lumpy jaw
• Luna
• luna moth
• lunacy
• lunar
• lunar calendar
• lunar caustic
• lunar crater