noun
the quality of being unwilling to change or compromise
adjective
describing someone or something as not easily bending or adapting
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The company's inflexibility in adapting to market changes ultimately led to its downfall.
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His inflexibility in trying new foods makes it difficult to take him out to eat.
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She's so inflexible, she never wants to change her plans for anything.
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The inflexibility of the old oak tree in the storm symbolized the strength and resilience of nature.