The Collaborative International Dictionary of English v.0.48:

Humble \Hum"ble\, v. t. [imp. & p. p. Humbled; p. pr. & vb. n.
   Humbling.]
   1. To bring low; to reduce the power, independence, or
      exaltation of; to lower; to abase; to humilate.
      [1913 Webster]

            Here, take this purse, thou whom the heaven's
            plagues
            Have humbled to all strokes.          --Shak.
      [1913 Webster]

            The genius which humbled six marshals of France.
                                                  --Macaulay.
      [1913 Webster]

   2. To make humble or lowly in mind; to abase the pride or
      arrogance of; to reduce the self-sufficiently of; to make
      meek and submissive; -- often used rexlexively.
      [1913 Webster]

            Humble yourselves therefore under the mighty hand of
            God, that he may exalt you.           --1 Pet. v. 6.

   Syn: To abase; lower; depress; humiliate; mortify; disgrace;
        degrade.
        [1913 Webster]

WordNet (r) 3.0 (2006):

humbled
    adj 1: subdued or brought low in condition or status; "brought
           low"; "a broken man"; "his broken spirit" [syn: broken,
           crushed, humbled, humiliated, low]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "humbled":
   abashed, abject, apologetic, ashamed, blushing, bowed down, broken,
   brought down, brought low, chagrined, chapfallen, conquered,
   contrite, crestfallen, crushed, diminished, domesticated,
   embarrassed, felled, flattened, hangdog, housebroke, housebroken,
   humble, humiliated, in the dust, lowered, made to grovel, mastered,
   melted, mortified, out of countenance, penitent, penitential,
   penitentiary, put down, quelled, red-faced, reduced, repentant,
   set down, shamed, shamefaced, shamefast, sheepish, smashed,
   softened, subdued, subjugated, suppressed, tamed, touched,
   vanquished