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

See also: dark

• overprint
• overproduce
• overproduction
• overproof
• overprotect
• overprotection
• overprotective
• overproud
• overqualified
• overrate
• overrating
• overreach
• overreaching
• overreact
• overreaction
• overreckoning
• overrefine
• overrefined
• overrefinement
• override
• overriding
• overripe
• overrule
• overrun
• oversea