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

• consonantly
• consonate
• consort
• consortium
• conspecific
• conspectus
• conspicuity
• conspicuous
• conspicuous consumption
• conspicuously
• conspicuousness
• conspiracy
• conspiracy of silence
• conspirative
• conspirator
• conspiratorial
• conspiratorially
• conspire
• constable
• constabulary
• Constance
• constancy
• constant
• Constant Lambert
• constant of gravitation