1.Definition: relating to or made or done by or as if by an elf
"Elfin bells", "All the little creatures joined in the elfin dance"
2.Definition: small and delicate
"She was an elfin creature--graceful and delicate", "Obsessed by things elfin and small"
3.Definition: suggestive of an elf in strangeness and otherworldliness
"Thunderbolts quivered with elfin flares of heat lightning"
4.Definition: usually good-naturedly mischievous
"Perpetrated a practical joke with elfin delight"