i Register
In some senses, quaintness is marked as obsolete. Watch for register when choosing this word.
noun
Cunning; craftiness.
Skill, artfulness.
Primness, fastidiousness, preciousness.
As for good Terence, I allow the quaintnesse [translating mignardise] and grace of his Latine tongue, and judge him wonderfull conceited and apt[…].
The state or fact of being quaint; having old-fashioned charm.