Source : Webster's Revised Unabridged Dictionary (1913)

Inextensible \In`ex*ten"si*ble\, a.
   Not capable of being extended; not elastic; as, inextensible
   fibers.

Source : WordNet®

inextensible
     adj : not extensile [syn: {nonextensile}, {nonprotractile}] [ant:
           {extensile}]