infernal
in.fer.nal \in-'f*rn-*l\ \-*l-e-\ aj [ME, fr. OF, fr. LL infernalis, fr. infernus hell, fr. L, lower; ak]in to L inferus inferior 1: of or relating to a nether world of the dead 2a: of or relating to hell 2b: HELLISH, DIABOLICAL 3: DAMNABLE, DAMNED - in.fer.nal.ly av