Source : Webster's Revised Unabridged Dictionary (1913)

Overly \O"ver*ly\, a.
   1. Careless; negligent; inattentive; superfical; not
      thorough. [Archaic] --Bp. Hall.

   2. Excessive; too much. [R.] --Coleridge.

Overly \O"ver*ly\, adv.
   In an overly manner. [Archaic]

Source : WordNet®

overly
     adv : to an excessive degree; "too big" [syn: {excessively}, {to a
           fault}, {too}]