Source : Webster's Revised Unabridged Dictionary (1913)

Incessantly \In*ces"sant*ly\, adv.
   Unceasingly; continually. --Shak.

Source : WordNet®

incessantly
     adv : with unflagging resolve; "dance inspires him ceaselessly to
           strive higher and higher toward the shining pinnacle of
           perfection that is the goal of every artiste" [syn: {endlessly},
            {ceaselessly}, {unceasingly}, {unendingly}, {continuously}]