The Collaborative International Dictionary of English v.0.48:
Inevitableness \In*ev"i*ta*ble*ness\, n. The state of being unavoidable; certainty to happen; inevitability. --Prideaux. [1913 Webster]WordNet (r) 3.0 (2006):
inevitableness n 1: the quality of being unavoidable [syn: inevitability, inevitableness]