Source : Webster's Revised Unabridged Dictionary (1913)

Fettered \Fet"tered\, a. (Zo["o]l.)
   Seeming as if fettered, as the feet of certain animals which
   bend backward, and appear unfit for walking.

Source : WordNet®

fettered
     adj : bound by chains fastened around the ankles [syn: {in
           bonds(p)}, {in fetters(p)}, {shackled}]