abyss
abyss \*-'bis\ n [ME abissus, fr. LL abyssus, fr. Gk abyssos, fr. abyssosX bottomless, fr. a- + byssos depth; akin to Gk bathys deep - more at BATHY- 1: the bottomless gulf, pit, or chaos of the old cosmogonies 2a: an immeasurably deep gulf or great space 2b: intellectual or spiritual profundity; also : vast moral depravi ty