Source : Webster's Revised Unabridged Dictionary (1913)

Groom \Groom\, v. i. [imp. & p. p. {Groomed}; p. pr. & vb. n.
   {Grooming}.]
   To tend or care for, or to curry or clean, as a, horse.

Source : WordNet®

groomed
     adj : neat and smart in appearance; well cared for; "the manager
           was a beautifully groomed young man"; "his horse was
           always groomed" [ant: {ungroomed}]