Synonyms for Fey (same or very similar meaning)
WordNet sense 1 (slightly insane):
touchedWordNet sense 2 (afflicted with or characteristic of mental derangement):
insaneWordNet sense 3 (suggestive of an elf in strangeness and otherworldliness):
elfinWordNet sense 4 (not existing in nature or subject to explanation according to natural laws; not physical or material):
supernaturalFrom the ODE community, based on WordNetadd/edit