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Relentless (adjective)
Unrelenting or unyielding in severity
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Relentless (adjective)
Unremitting, steady and persistent
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Tenacious (adjective)
Clinging to an object or surface; adhesive.
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Tenacious (adjective)
Unwilling to yield or give up; dogged.
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Tenacious (adjective)
Holding together; cohesive.
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Tenacious (adjective)
Having a good memory; retentive.
Wiktionary
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Tenacious (adjective)
tending to keep a firm hold of something; clinging or adhering closely
“a tenacious grip”
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Tenacious (adjective)
not readily relinquishing a position, principle, or course of action; determined
“this tenacious defence of local liberties”
“you’re tenacious and you get at the truth”
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Tenacious (adjective)
persisting in existence; not easily dispelled
“a tenacious local legend”
Oxford Dictionary
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