The Collaborative International Dictionary of English v.0.48:

Infusibility \In*fu`si*bil"i*ty\, n. [From Infuse.]
   Capability of being infused, poured in, or instilled.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Infusibility \In*fu`si*bil"i*ty\, n. [Pref. in- not +
   fusibility: cf. F. infusibilit['e].]
   Incapability or difficulty of being fused, melted, or
   dissolved; as, the infusibility of carbon.
   [1913 Webster]