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
If you describe someone as fey, you mean that they behave in a shy, childish, or unpredictable way, and you are often suggesting that this is unnatural or insincere. Her fey charm and eccentric ways were legendary. = whimsical. very sensitive and behaving or talking in a strange way