Source : Webster's Revised Unabridged Dictionary (1913)

Promptly \Prompt"ly\, adv.
   In a prompt manner.

Source : WordNet®

promptly
     adv 1: with little or no delay; "the rescue squad arrived
            promptly"; "come here, quick!" [syn: {quickly}, {quick}]
     2: in a punctual manner; "he did his homework promptly" [syn: {readily},
         {pronto}, {without delay}]
     3: at once (usually modifies an undesirable occurrence); "he
        promptly forgot the address" [syn: {right away}]