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

• Sir George Otto Trevelyan
• Sir George Paget Thomson
• Sir Geraint
• Sir Hans Adolf Krebs
• Sir Harold George Nicolson
• Sir Harold Walter Kroto
• Sir Harry MacLennan Lauder
• Sir Henry Bessemer
• Sir Henry Joseph Wood
• Sir Henry Maxmilian Beerbohm
• Sir Henry Morgan
• Sir Henry Morton Stanley
• Sir Henry Percy
• Sir Henry Rider Haggard
• Sir Henry Wood
• Sir Herbert Beerbohm Tree
• Sir Hiram Stevens Maxim
• Sir Howard Walter Florey
• Sir Humphrey Davy
• Sir Humphrey Gilbert
• Sir Isaac Newton
• Sir Isaac Pitman
• Sir Jack Hobbs
• Sir Jacob Epstein
• Sir James Augustus Henry Murray