Source : Webster's Revised Unabridged Dictionary (1913)

Humbleness \Hum"ble*ness\, n.
   The quality of being humble; humility; meekness.

Source : WordNet®

humbleness
     n 1: the state of being humble and unimportant [syn: {unimportance},
           {obscureness}]
     2: a humble feeling; "he was filled with humility at the sight
        of the Pope" [syn: {humility}] [ant: {pride}]
     3: a disposition to be humble; a lack of false pride; "not
        everyone regards humility as a virtue" [syn: {humility}]
        [ant: {pride}]