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in‧flex‧i‧ble

1 unwilling to make even the slightest change in your attitudes, plans etc [≠ flexible]:
inflexible attitudes towards change
inflexible attitudes towards change2 inflexible rules, arrangements etc are impossible to change [≠ flexible]:
This approach is too inflexible and too costly.
This approach is too inflexible and too costly.3 inflexible material is stiff and will not bend [≠ flexible]
—inflexibly adverb
—inflexibility
noun [uncountable]
noun [uncountable]