Source : Webster's Revised Unabridged Dictionary (1913)

Brutish \Bru"tish\, a.
   Pertaining to, or resembling, a brute or brutes; of a cruel,
   gross, and stupid nature; coarse; unfeeling; unintelligent.

         O, let all provocation Take every brutish shape it can
         devise.                                  --Leigh Hunt.

         Man may . . . render himself brutish, but it is in vain
         that he would seek to take the rank and density of the
         brute.                                   --I. Taylor.

   Syn: Insensible; stupid; unfeeling; savage; cruel; brutal;
        barbarous; inhuman; ferocious; gross; carnal; sensual;
        bestial. -- {Bru"tish*ly}, adv. -- {Bru"tish*ness}, n.

Source : WordNet®

brutishly
     adv : in an inhumane manner; "she treated her husband bestially"
           [syn: {bestially}, {in a beastly manner}]