unnecessarily

from WordNet (r) 3.0 (2006)

unnecessarily
    adv 1: in an unnecessary manner; "they were unnecessarily rude"
           [ant: {necessarily}, {needfully}]
    2: without any necessity; "this marathon would exhaust him
       unnecessarily"

from The Collaborative International Dictionary of English v.0.48

Unnecessary \Un*nec"es*sa*ry\, a.
   Not necessary; not required under the circumstances; unless;
   needless; as, unnecessary labor, care, or rigor. --
   {Un*nec"es*sa*ri*ly}, adv. -- {Un*nec"es*sa*ri*ness}, n.
   [1913 Webster]
   [1913 Webster]