unyielding

US /ʌnˈjiːl.dɪŋ/
UK /ʌnˈjiːl.dɪŋ/
"unyielding" picture
1.

not giving way to pressure; hard or solid

:
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The ancient oak tree stood unyielding against the strong winds.
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The rock formation was unyielding, resisting all attempts at erosion.
:
inflexiblerigidstifffirmhard
:
yieldingflexiblesoftpliable
2.

not giving in to argument, plea, or persuasion; resolute

:
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Despite our pleas, she remained unyielding in her decision.
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His unyielding determination led him to achieve his goals.
:
resoluteadamantfirmsteadfastunwavering
:
yieldingflexiblecompliantsubmissivewavering