The Collaborative International Dictionary of English v.0.48:

Intimidate \In*tim"i*date\, v. t. [imp. & p. p. Intimidated;
   p. pr. & vb. n. Intimidating.] [LL. intimidatus, p. p. of
   intimidare to frighten; pref. in- in + timidus fearful,
   timid: cf. F. intimider. See Timid.]
   To make timid or fearful; to inspire of affect with fear; to
   deter, as by threats; to dishearten; to abash.
   [1913 Webster]

         Now guilt, once harbored in the conscious breast,
         Intimidates the brave, degrades the great. --Johnson.

   Syn: To dishearten; dispirit; abash; deter; frighten;
        terrify; daunt; cow.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

intimidated \intimidated\ adj.
   1. made timid or fearful as by threats.
      [WordNet 1.5]

   2. frightened into submission or compliance.

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

WordNet (r) 3.0 (2006):

intimidated
    adj 1: made timid or fearful as by threats

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "intimidated":
   afraid, aghast, appalled, ashen, astounded, awed, awestricken,
   awestruck, blanched, chicken, chickenhearted, coward, cowardly,
   cowed, daunted, deadly pale, dismayed, fainthearted, fearful,
   frozen, funking, funky, gray with fear, henhearted, horrified,
   horror-struck, 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