Egypt is eternal, one might say, but its problems are infernal.
infernal, it can cause fires and explosions; toxic, it can debilitate, poison, and kill.
Of course there will be deranged people who will rejoice in their weird conviction of his eternal and infernal roasting.
late 14c., in reference to the underworld, from Old French enfernal, infernal (12c.), from Late Latin infernalis "of the lower regions," from infernus "hell" (Ambrose), literally "the lower (world)," noun use of Latin infernus "lower, lying beneath," from infra "below" (see infra-). Meaning "devilish, hateful" is from early 15c. For the name of the place, or things which resemble it, the Italian form inferno has been used in English since 1834, from Dante. Related: Infernally.