The Collaborative International Dictionary of English v.0.48:

Eerie \Ee"rie\, Eery \Ee"ry\, a. [Scotch, fr. AS. earh timid.]
   1. Serving to inspire fear, esp. a dread of seeing ghosts;
      wild; weird; as, eerie stories.
      [1913 Webster]

            She whose elfin prancer springs
            By night to eery warblings.           --Tennyson.
      [1913 Webster]

   2. Affected with fear; affrighted. --Burns.
      [1913 Webster]

WordNet (r) 3.0 (2006):

eerie
    adj 1: suggestive of the supernatural; mysterious; "an eerie
           feeling of deja vu"
    2: inspiring a feeling of fear; strange and frightening; "an
       uncomfortable and eerie stillness in the woods"; "an eerie
       midnight howl" [syn: eerie, eery]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "eerie":
   arcane, awe-inspiring, awesome, awful, awing, bizarre, blue,
   cadaverous, corpselike, crawly, creepy, deadly, deathlike, deathly,
   deathly pale, dreadful, eldritch, esoteric, extramundane,
   extraterrestrial, fantastic, fey, frightening, ghastly, ghostlike,
   ghostly, grisly, grotesque, gruesome, haggard, hypernormal,
   hyperphysical, livid, lurid, macabre, mortuary, mysterious,
   numinous, occult, otherworldly, pale, preterhuman, preternatural,
   preternormal, pretersensual, psychic, scary, spectral, spiritual,
   spookish, spooky, strange, superhuman, supernatural, supernormal,
   superphysical, supersensible, supersensual, supramundane,
   supranatural, transcendental, transmundane, uncanny, unco,
   uncolike, unearthly, unhuman, unworldly, wan, weird