Source : Webster's Revised Unabridged Dictionary (1913)

Gushingly \Gush"ing*ly\, adv.
   1. In a gushing manner; copiously. --Byron.

   2. Weakly; sentimentally; effusively. [Colloq.]

Source : WordNet®

gushingly
     adv : in a gushing manner; "a gushingly prolific writer"