unyielding

Adjective
  1. Stubbornly unyielding (synset 302335561)
    "dogged persistence"; "dour determination"; "the most vocal and pertinacious of all the critics"; "a mind not gifted to discover truth but tenacious to hold it"; "men tenacious of opinion"
  2. Resistant to physical force or pressure (synset 301156123)
    "an unyielding head support"

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