Infernal

1. adjective

   of or pertaining to or characteristic of a very uncontrolled and intense fire

   “infernal heat”

2. adjective

   extremely evil or cruel; expressive of cruelty or befitting hell

   “something demonic in him--something that could be cruel”

   Similar: demonic, diabolic, diabolical, fiendish, hellish, satanic

3. adjective

   expletives used informally as intensifiers

   “he's a blasted idiot”

   Similar: blasted, blame, blamed, blessed, damn, damned

4. adjective

   characteristic of or resembling Hell

   “infernal noise”