adjective
a word that describes or modifies a noun, in this case, 'unteachable' describes someone or something that cannot be taught
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Some students may be labeled as unteachable due to their lack of progress in traditional learning environments.
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That kid is unteachable, he never pays attention in class.
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She's so unteachable, it's like talking to a brick wall.
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The concept of time travel may seem unteachable at first, but with the right explanation, it can be understood.