nonextensile

/ˌnɑnɪkˈstɛnsəl/
adjective
  1. Not able to be stretched or extended; not capable of being made longer or larger.
    • The nonextensile fabric kept its shape perfectly even after years of use.
    • The rope was made of a nonextensile material, so it wouldn't stretch under tension.
    • Unlike rubber, this metal wire is nonextensile and will break if pulled too hard.
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