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

• self-indulgently
• self-inflicted
• self-insurance
• self-interest
• self-interested
• self-involved
• self-justification
• self-knowledge
• self-limited
• self-loader
• self-loading
• self-locking
• self-love
• self-loving
• self-luminous
• self-made
• self-mortification
• self-moving
• self-opinionated
• self-organisation
• self-organization
• self-perpetuating
• self-pity
• self-pitying
• self-pollinated