"unwavering" 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. level, unwavering
not showing abrupt variations
"spoke in a level voice"
"she gave him a level look"- Louis Auchincloss
Source: WordNet® (An amazing lexical database of English)
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