Source : Webster's Revised Unabridged Dictionary (1913)

Unbowed \Un*bowed"\, a. [Pref. un- not + bowed.]
   Not bent or arched; not bowed down. --Byron.

Source : WordNet®

unbowed
     adj 1: erect in posture; "behind him sat old man Arthur; he was
            straight with something angry in his attitude"; "stood
            defiantly with unbowed back" [syn: {straight}, {unbent},
             {upright}]
     2: not forced to bow down to a conqueror