"steadfast" in the adjective sense
1. firm, steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering
marked by firm determination or resolution not shakable
"firm convictions"
"a firm mouth"
"steadfast resolve"
"a man of unbendable perseverence"
"unwavering loyalty"
2. steadfast, staunch, unswerving
firm and dependable especially in loyalty
"a steadfast ally"
"a staunch defender of free speech"
"unswerving devotion"
"unswerving allegiance"
Source: WordNet® (An amazing lexical database of English)
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