- hellish; fiendish; diabolical: an infernal plot.
- extremely troublesome, annoying, etc.; atrocious: an infernal nuisance.
- of, inhabiting, or befitting hell.
- of or relating to the underworld.
- of or relating to an underworld of the dead
- deserving hell or befitting its occupants; diabolic; fiendish
- irritating; confounded
