Synonyms for Irresistible (same or very similar meaning)
WordNet sense 1 (so strong as to be irresistible):
overpowering, overwhelmingWordNet sense 2 (impossible to resist; overpowering):
resistlessWordNet sense 3 (pleasing to the eye or mind especially through beauty or charm):
attractiveFrom the ODE community, based on WordNetadd/edit