- 1so strong that it cannot be stopped or resisted I felt an irresistible urge to laugh. His arguments were irresistible. The temptation proved irresistible. opposite resistible
- 2so attractive that you feel you must have it an irresistible bargain On such a hot day, the water was irresistible (= it made you want to swim in it). irresistible to somebody The bright colors were irresistible to the baby.
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NAmE//ˌɪrɪˈzɪstəbli//adverb They were irresistibly drawn to each other.