Webster's English Dictionary

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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