Acherontic

adjective3

1. •
   Of, pertaining to or resembling Acheron (one of the rivers located in the underworld according to ancient Greek mythology).

   • It was a Comedy, to see what a crowding (as if it had bene at a newe Play,) there was vpon the Acheronticque Strond, — 1607
2. •
   (figurative) Of or pertaining to hell.

   • How did those Aegyptians storme, when Moses and Aaron, Crumwell and Cranmer came, to deliuer Gods Israel, from that Acheronticall ignorance? — 1623
3. •
   (figurative) Lacking joy and comfort; nearing death.

   • Depart to blacke nights Acheronticke Cell, — 1599