Source : Webster's Revised Unabridged Dictionary (1913)

Quaintly \Quaint"ly\, adv.
   In a quaint manner. --Shak.

Source : WordNet®

quaintly
     adv 1: in a strange but not unpleasant manner; "the old lady
            expressed herself somewhat quaintly"
     2: in a quaint old-fashioned manner; "the room was quaintly
        furnished"