Main Entry: in·fer·nal

Pronunciation: \in-ˈfər-n^əl\

Function: adjective

Etymology: Middle English, from Anglo-French enfernal, from Late Latin infernalis, from infernus hell, from Latin, lower, from inferus

Date: 14th century

1 : of or relating to a nether world of the dead
2 a : of or relating to hell b : hellish, diabolical
3 : damnable <an infernal nuisance>

— in·fer·nal·ly \-n^əl-ē\ adverb