Adjective
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incapable of adapting or changing to meet circumstances
"a rigid disciplinarian"
"an inflexible law"
"an unbending will to dominate"
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resistant to being bent
"an inflexible iron bar"
"an inflexible knife blade"
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not making concessions
"took an uncompromising stance in the peace talks"
"uncompromising honesty"
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incapable of change
"a man of inflexible purpose"