IPA: /ˌɪrɪˈzɪstəˌbɪlɪti/
KK: /ˌɪrɪˈzɪstəˌbɪlɪti/
The quality of being so attractive or appealing that it cannot be resisted or refused.
Her charm and kindness gave her an air of irresistibility that drew people to her.
Irresistibility → It is formed from "in-" (meaning not), "resist" (from Latin "resistere", meaning to stand back or oppose), and "-ibility" (from Latin "-ibilis", meaning capable of). The word describes a quality of being not capable of being opposed or resisted.
Think of something that is 'not' ('in-') able to be 'opposed' ('resist') — that's why irresistibility means something that cannot be resisted.