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Definition of unearthly : Not terrestrial; supernatural; preternatural; hence, weird; appalling; terrific; as, an unearthly sight or sound.

Synonyms:

Satanic, extrasensory, appalling, haunting, cockeyed, superhuman, idiotic, dippy, demoniac, mad, fear, spectral, harebrained, balmy, extramundane, absurd, wacky, spookish, jerky, sappy, ghostly, chilling, creepy, insane, transcendent, tomfool, funereal, alarming, awesome, imbecilic, scary, intimidating, superphysical, otherworldly, menacing, magical, softheaded, preposterous, fiendish, supersensible, uncanny, weird, nonsensical, ability, transcendental, silly, ghastly, lunatic, haunted, devilish, miraculous, phenomenal, preternatural, moronic, foolish, frightening, crazy, zany, ghostlike, eldritch, loopy, hair-raising, metaphysical, apparitional, paranormal, sepulchral, knowledge, loony, spooky, supernormal, usual, dopey, phantasmal, religious

bodiless, supernatural, imaginary, theoretical, unworldly, abstract, conceptual, incorporeal, spiritual, unsubstantial, imponderable, immaterial, intangible, eerie, ethereal, impalpable

Usage examples:

• But if fresh snow has fallen, the trees and copses and the great rocks take on giant, unearthly shapes, as though they had come from another world in the night. - "Look Back on Happiness", Knut Hamsun.
• But when I looked up at the moon and remembered its erratic climate and our wild, unearthly journey, I could not suppress a feeling of satisfaction with my changed condition. - "Daybreak: A Romance of an Old World", James Cowan.
• Well, extraordinary as it may seem, you can make my fortune if you will both come to the Felborn Theatre at the unearthly hour of nine to- morrow morning, and ask to be shown into Mr. Felborn's private office. - "Lord John in New York", C. N. Williamson A. M. Williamson.