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[more irresistible; most irresistible]
: impossible to resist especially because of strength or attractiveness
The force of the waves was irresistible.
She had an irresistible [=very strong] craving for chocolate.
Women find him irresistible. [=women think he is very attractive]
— irresistibly /ˌirɪˈzɪstəbli/ adverb
He was irresistibly attracted to her.