Source : Webster's Revised Unabridged Dictionary (1913)

Unbind \Un*bind"\, v. t. [imp. & p. p. {Unbound}; p. pr. & vb.
   n. {Unbinding}.] [AS. unbindan. See {Un-}, and {Bind}.]
   To remove a band from; to set free from shackles or
   fastenings; to unite; to unfasten; to loose; as, unbind your
   fillets; to unbind a prisoner's arms; to unbind a load.

Unbound \Un*bound"\,
   imp. & p. p. of {Unbind}.

Source : WordNet®

unbind
     v : untie or unfasten; "unbind the feet of this poor woman"
         [ant: {bind}]
     [also: {unbound}]

unbound
     adj 1: not secured within a cover; "an unbound book" [ant: {bound}]
     2: not restrained or tied down by bonds [ant: {bound}]
     3: not held in chemical or physical combination

unbound
     See {unbind}