The Collaborative International Dictionary of English v.0.48:

Fey \Fey\ (f[=a]), a. [AS. f[=ae]ga, Icel. feigr, OHG. feigi.]
   Fated; doomed. [Old Eng. & Scot.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fey \Fey\ (f[=a]), n. [See Fay faith.]
   Faith. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fey \Fey\, v. t. [Cf. Feague.]
   To cleanse; to clean out. [Obs.] --Tusser.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fey
    adj 1: slightly insane [syn: fey, touched(p)]
    2: suggestive of an elf in strangeness and otherworldliness;
       "thunderbolts quivered with elfin flares of heat lightning";
       "the fey quality was there, the ability to see the moon at
       midday"- John Mason Brown [syn: elfin, fey]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "fey":
   abnormal, anomalous, arcane, crank, crankish, cranky, crotchety,
   deviant, deviative, different, divergent, dotty, eccentric, eerie,
   erratic, esoteric, exceptional, extramundane, extraterrestrial,
   flaky, freakish, funny, hypernormal, hyperphysical, idiocratic,
   idiosyncratic, irregular, kinky, kooky, maggoty, mysterious,
   numinous, nutty, occult, odd, oddball, otherworldly, peculiar,
   preterhuman, preternatural, preternormal, pretersensual, psychic,
   queer, quirky, screwball, screwy, singular, spiritual, strange,
   superhuman, supernatural, supernormal, superphysical,
   supersensible, supersensual, supramundane, supranatural,
   transcendental, transmundane, twisted, unconventional, unearthly,
   unhuman, unnatural, unworldly, wacky, whimsical