Source : Webster's Revised Unabridged Dictionary (1913)

Unbending \Un*bend"ing\, a. [In senses 1, 2, and 3, pref. un-
   not + bending; in sense 4, properly p. pr. unbend.]
   1. Not bending; not suffering flexure; not yielding to
      pressure; stiff; -- applied to material things.

            Flies o'er unbending corn, and skims along the main.
                                                  --Pope.

   2. Unyielding in will; not subject to persuasion or
      influence; inflexible; resolute; -- applied to persons.

   3. Unyielding in nature; unchangeable; fixed; -- applied to
      abstract ideas; as, unbending truths.

   4. Devoted to relaxation or amusement. [R.]

            It may entertain your lordships at an unbending
            hour.                                 --Rowe.
      -- {Un*bend"ing*ly}, adv. -- {Un*bend"ing*ness}, n.

Unbend \Un*bend"\, v. t. [imp. & p. p. {Unbent}; p. pr. & vb. n.
   {Unbending}.] [1st pref. un- + bend.]
   1. To free from flexure; to make, or allow to become,
      straight; to loosen; as, to unbend a bow.

   2. A remit from a strain or from exertion; to set at ease for
      a time; to relax; as, to unbend the mind from study or
      care.

            You do unbend your noble strength.    --Shak.

   3. (Naut.)
      (a) To unfasten, as sails, from the spars or stays to
          which they are attached for use.
      (b) To cast loose or untie, as a rope.

Source : WordNet®

unbending
     adj : incapable of adapting or changing to meet circumstances; "a
           rigid disciplinarian"; "an inflexible law"; "an
           unbending will to dominate" [syn: {inflexible}, {rigid}]