adjective
not able to be understood; incomprehensible
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The lecturer's accent was so strong that his speech became unintelligible to most of the audience.
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I couldn't make out a single word he said, it was completely unintelligible.
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The rapper's lyrics were so mumbled and slurred that they were practically unintelligible.
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The artist's abstract painting was so chaotic and confusing that it appeared unintelligible to most viewers.