Source : Webster's Revised Unabridged Dictionary (1913)

Doubly \Dou"bly\, adv.
   1. In twice the quantity; to twice the degree; as, doubly
      wise or good; to be doubly sensible of an obligation.
      --Dryden.

   2. Deceitfully. ``A man that deals doubly.'' --Huloet.

Source : WordNet®

doubly
     adv 1: to double the degree; "she was doubly rewarded"; "his eyes
            were double bright" [syn: {double}, {twice}]
     2: in a twofold manner; "he was doubly wrong" [syn: {in two
        ways}]