Etymology
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eldritch (adj.)

"hideous, ghastly, weird," c. 1500, of uncertain origin; apparently somehow from elf (compare Scottish variant elphrish), an explanation OED finds "suitable;" Watkins connects its elements with Old English el- "else, otherwise" (from PIE root *al- "beyond") + rice "realm" (from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line," thus "to lead, rule").

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Definitions of eldritch

eldritch (adj.)
suggesting the operation of supernatural influences; "stumps...had uncanny shapes as of monstrous creatures"- John Galsworthy; "he could hear the unearthly scream of some curlew piercing the din"- Henry Kingsley;
an eldritch screech
Synonyms: weird / uncanny / unearthly
From wordnet.princeton.edu