Synonyms of the word

chthonic

• adj. Dwelling within or under the earth.

chthonian

• adj. Pertaining to the underworld; being beneath the earth.

infernal

• adj. Of or relating to hell, or the world of the dead; hellish.
• adj. (by extension) Of or relating to a fire or inferno.
• adj. Stygian, gloomy.
• adj. Diabolical or fiendish.
• adj. (as an expletive, not vulgar) Very annoying; damned.
• n. (obsolete) An inhabitant of the infernal regions.

nether

• adj. Lower; under.
• adj. Lying beneath, or conceived as lying beneath, the Earth’s surface.
• adv. Down; downward.
• adv. Low; low down.
• v. (transitive, Britain dialectal, Northern England, Scotland) To bring or thrust down; bring or make low;…
• v. (transitive, Britain dialectal, Northern England, Scotland) To constrict; straiten; confine; restrict;…
• v. (transitive, Britain dialectal, Scotland) To pinch or stunt with cold or hunger; check in growth; shrivel;…
• v. (transitive, Britain dialectal, Scotland) To shrink or huddle, as with cold; be shivery; tremble.
• v. (transitive, Britain dialectal, Scotland) To depreciate; disparage; undervalue.
• n. (Britain dialectal, Scotland) Oppression; stress; a withering or stunting influence.
• n. (mining) A trouble; a fault or dislocation in a seam of coal.