WordWeb Online

1. Suggestive of an elf in strangeness and otherworldliness
   "thunderbolts quivered with elfin flares of heat lightning";
   - fey
    
2. Small and delicate
   "obsessed by things elfin and small"; "she was an elfin creature--graceful and delicate";
   - elflike
    
3. Relating to or made or done by or as if by an elf
   "elfin bells"; "all the little creatures joined in the elfin dance"
    
4. Usually good-naturedly mischievous
   "perpetrated a practical joke with elfin delight";
   - elfish, elvish

See also: little, ludic, playful, small, supernatural

Encyclopedia: Elfin