资料来源 : Webster's Revised Unabridged Dictionary (1913)

Irresistibleness \Ir`re*sist"i*ble*ness\, n.
   Quality of being irrestible.

资料来源 : WordNet®

irresistibleness
     n : the quality of being overpowering and impossible to resist
         [syn: {irresistibility}]