Ach"ing*ly

from The Collaborative International Dictionary of English v.0.48

Aching \Ach"ing\, a.
   That aches; continuously painful. See {Ache}. --
   {Ach"ing*ly}, adv.
   [1913 Webster]

         The aching heart, the aching head.       --Longfellow.
   [1913 Webster]