"unyielding" in the adjective sense
1. dogged, dour, persistent, pertinacious, tenacious, unyielding
stubbornly unyielding
"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"- T.S.Eliot
"men tenacious of opinion"
2. unyielding
resistant to physical force or pressure
"an unyielding head support"
Source: WordNet® (An amazing lexical database of English)
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