1. fey, touched(predicate), insane (vs. sane)

usage: slightly insane

2. elfin, fey, supernatural (vs. natural)

usage: 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

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See also: fey (Dictionary)