The Collaborative International Dictionary of English v.0.48:

bested \best"ed\ adj.
   same as defeated.

   Syn: outdone.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Bestead \Be*stead"\, v. t. [imp. & p. p. Bestead or Bested,
   also (Obs.) Bestad. In sense 3 imp. also Besteaded.]
   [Pref. be- + stead a place.]
   1. To put in a certain situation or condition; to
      circumstance; to place. [Only in p. p.]
      [1913 Webster]

            They shall pass through it, hardly bestead and
            hungry: . . . and curse their king and their God.
                                                  --Is. viii.
                                                  21.
      [1913 Webster]

            Many far worse bestead than ourselves. --Barrow.
      [1913 Webster]

   2. To put in peril; to beset.

   Note: [Only in p. p.] --Chaucer.
         [1913 Webster]

   3. To serve; to assist; to profit; to avail. --Milton.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "bested":
   all up with, beat, beaten, confounded, defeated, discomfited,
   done for, done in, down, fallen, fixed, floored, hors de combat,
   lambasted, lathered, licked, on the skids, outdone, overborne,
   overcome, overmastered, overmatched, overpowered, overridden,
   overthrown, overturned, overwhelmed, panicked, put to rout, routed,
   ruined, scattered, settled, silenced, skinned, skinned alive,
   stampeded, trimmed, trounced, undone, upset, whelmed, whipped,
   worsted