dark-eyed and delightful
quiddity: the essential quality of a thing; a trifling distinction, quibble
< Middle French quiddité < Late Latin quidditas < Latin quid "what" + -itas "-ness"
Good word! I like how it means two sort of opposite things: an essential quality AND a trifling distinction.
Auto-antonyms are great! (My personal favorite being "cleave")