Definition of "Elfin" :

adjective: small and delicate

"She was an elfin creature--graceful and delicate."

adjective: suggestive of an elf in strangeness and otherworldliness

"Thunderbolts quivered with elfin flares of heat lightning."

adjective: usually good-naturedly mischievous

"Perpetrated a practical joke with elfin delight."

adjective: relating to or made or done by or as if by an elf

"Elfin bells."