Source : Webster's Revised Unabridged Dictionary (1913)

Infrangible \In*fran"gi*ble\, a. [Pref. in- not + grangible:
   cf.F. infrangible.]
   1. Not capable of being broken or separated into parts; as,
      infrangible atoms.

            [He] link'd their fetlocks with a golden band
            Infrangible.                          --Pope.

   2. Not to be infringed or violated.

Source : WordNet®

infrangible
     adj 1: difficult or impossible to break or separate into parts; "an
            infrangible series"
     2: not capable of being violated or infringed; "infrangible
        human rights" [syn: {absolute}, {inviolable}]