The Collaborative International Dictionary of English v.0.48:
Inexorability \In*ex`o*ra*bil"i*ty\, n. [L. inexorabilitas: cf. F. inexorabilit['e].] The quality of being inexorable, or unyielding to entreaty. --Paley. [1913 Webster]WordNet (r) 3.0 (2006):
inexorability n 1: mercilessness characterized by an unwillingness to relent or let up; "the relentlessness or their pursuit" [syn: relentlessness, inexorability, inexorableness]