1. Hellish
   "Hence loathed Melancholy.../In Stygian cave forlorn" 
2. Dark and dismal as of the rivers Acheron and Styx in Hades
   "upon those roseate lips a Stygian hue"
   - Acheronian, Acherontic

See also: dark, infernal

• parallel of latitude
• parallel operation
• parallel port
• parallel processing
• parallel-park
• parallel-veined leaf
• parallelepiped
• parallelepipedon
• parallelise
• parallelism
• parallelize
• parallelogram
• parallelopiped
• parallelopipedon
• paralogism
• paralogy
• paralyse
• paralysed
• paralysis
• paralysis agitans
• paralytic
• paralytic abasia
• paralytical
• paralyze
• paralyzed