unearthly

bizarre, curious, eerie (also eery), far-out, grotesque, outlandish, out-of-the-way, outrageous, outré, peculiar, quaint, queer, quirky, screwy, strange, wacky (also whacky), way-out, weird, wild

baffling, bewildering, confounding, mystifying, perplexing, puzzling, shocking

aberrant, atypical, fantastic (also fantastical), flaky, freak, freakish, idiosyncratic, marvelous (or marvellous), prodigious, rare, singular, uncommon, unique, unnatural, unusual

ghastly, ghostlike, ghostly, ghoulish, spectral

bizarre, curious, odd, outlandish, outré, peculiar, quaint, quirky

unaccustomed, uncommon, unusual

metaphysical, preternatural, supernatural

enigmatic (also enigmatical), inscrutable, mysterious, puzzling

mystic, mystical, occult, psychic (also psychical)

extrasensory

celestial, divine, ethereal, heavenly, spiritual, unworldly