impossible to understand synonym incomprehensible She turned away and muttered something unintelligible. unintelligible to somebody A lot of the jargon they use is unintelligible to outsiders. opposite intelligible
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NAmE//ˌʌnɪnˈtɛlədʒəbli//
adverbSee unintelligible in the Oxford Advanced Learner's DictionaryCheck pronunciation: unintelligible