adjective
An adjective is a word that describes or modifies a noun. In this case, 'stiff necked' is describing someone who is stubborn or inflexible in their beliefs or attitudes.
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The stiff-necked attitude of the board members made it difficult to reach a consensus.
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She's so stiff-necked, she never listens to anyone else's opinion.
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Don't be so stiff-necked about it, just go with the flow.
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His stiff-necked refusal to apologize only made the situation worse.