impossible to imagine or believe synonym unthinkable It is inconceivable that the manager was not aware of the problem. Then the inconceivable happened—I lost my job. opposite conceivable
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NAmE//ˌɪnkənˈsivəbli//
adverb She was inconceivably wealthy.See inconceivable in the Oxford Advanced Learner's DictionaryCheck pronunciation: inconceivable