The Collaborative International Dictionary of English v.0.48:

Cow \Cow\, v. t. [imp. & p. p. Cowed (koud); p. pr. & vb. n.
   Cowing.] [Cf. Icel. kuga, Sw. kufva to check, subdue, Dan.
   kue. Cf. Cuff, v. t.]
   To depress with fear; to daunt the spirits or courage of; to
   overawe.
   [1913 Webster]

         To vanquish a people already cowed.      --Shak.
   [1913 Webster]

         THe French king was cowed.               --J. R. Green.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

cowed \cowed\ adj.
   frightened into submission or compliance.

   Syn: browbeaten, bullied, hangdog, intimidated.
        [WordNet 1.5]

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "cowed":
   afraid, aghast, appalled, ashen, astounded, awed, awestricken,
   awestruck, blanched, chicken, chickenhearted, coward, cowardly,
   daunted, deadly pale, dismayed, fainthearted, fearful, frozen,
   funking, funky, gray with fear, henhearted, horrified,
   horror-struck, intimidated, lily-livered, milk-livered,
   milksoppish, milksoppy, mousy, overtimid, overtimorous,
   pale as death, pallid, panic-prone, panicky, paralyzed, petrified,
   pigeonhearted, rabbity, scared stiff, scared to death, sissified,
   sissy, soft, stunned, stupefied, terrified, terror-crazed,
   terror-haunted, terror-ridden, terror-riven, terror-shaken,
   terror-smitten, terror-struck, terror-troubled, timid, timorous,
   undone, unmanly, unmanned, unnerved, unstrung, weak, weak-kneed,
   weakhearted, white-livered, yellow