unmercifully

from WordNet (r) 3.0 (2006)

unmercifully
    adv 1: without pity; in a merciless manner; "he was mercilessly
           trounced by his opponent in the House" [syn:
           {mercilessly}, {pitilessly}, {unmercifully},
           {remorselessly}]

from The Collaborative International Dictionary of English v.0.48

Unmerciful \Un*mer"ci*ful\, a.
   Not merciful; indisposed to mercy or grace; cruel; inhuman;
   merciless; unkind. -- {Un*mer"ci*ful*ly}, adv. --
   {Un*mer"ci*ful*ness}, n.
   [1913 Webster]

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