unearthly

adjective

1 there was an unearthly chill in that ghastly chamber:

otherworldly, not of this world, supernatural, preternatural, extraterrestrial, alien;

ghostly, spectral, phantom, mysterious, haunted, chilling, spine-chilling, hair-raising, blood-curdling;

uncanny, eerie, macabre, strange, weird, unnatural, bizarre;

Scottish eldritch;

informal spooky, creepy, scary;

rare phantasmal, phantasmic.

▷antonyms normal, mundane.

2 informal they rise at some unearthly hour for the long drive:

unreasonable, preposterous, abnormal, extraordinary, absurd, ridiculous, horrendous, outrageous, unheard of, out of the ordinary;

informal ungodly, unholy, godawful.

▷antonyms reasonable.