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"

Related Adjective(s):elflike

3.Definition: suggestive of an elf in strangeness and otherworldliness

"Thunderbolts quivered with elfin flares of heat lightning"

Related Adjective(s):fey

4.Definition: usually good-naturedly mischievous

"Perpetrated a practical joke with elfin delight"

Related Adjective(s):elfish, elvish