/ ˌɪrɪˈzɪstəbl; NAmE / adjective
1.
so strong that it cannot be stopped or resisted :
I felt an irresistible urge to laugh.
His arguments were irresistible.
OPP resistible
2.
irresistible (to sb) so attractive that you feel you must have it :
an irresistible bargain
The bright colours were irresistible to the baby.
On such a hot day, the water was irresistible (= it made you want to swim in it) .
► ir·re·sist·ibly / -əbli; NAmE / adverb :
They were irresistibly drawn to each other.
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WORD ORIGIN
late 16th cent.: from medieval Latin irresistibilis , from in- not + resistibilis (from resistere resist).