IPA: /ˈkwentər/
KK: /kwentər/
More charmingly unusual or old-fashioned than something else.
The quainter village had narrow streets and old stone houses.
Quainter is derived from "quaint" (from Old French *cointe*, meaning clever or elegant) and the comparative suffix "-er" (meaning more). The word "quainter" means more quaint or more charmingly unusual.
Think of something that is 'clever' or 'elegant' ('quaint') and remember that 'quainter' means it is even more charmingly unusual.