Source : Webster's Revised Unabridged Dictionary (1913)

Fitly \Fit"ly\, adv.
   In a fit manner; suitably; properly; conveniently; as, a
   maxim fitly applied.

Source : WordNet®

fitly
     adv : in an appropriate manner; "he was appropriately dressed"
           [syn: {appropriately}, {suitably}, {fittingly}, {befittingly}]
           [ant: {inappropriately}, {inappropriately}]