unfaltering

英 [ʌn'fɔːlt(ə)rɪŋ; -'fɒl-] 美[ʌn'fɔltərɪŋ]

1. marked by firm determination or resolution; not shakable;: "firm convictions"; "a firm mouth"; "steadfast resolve"; "a man of unbendable perseverence"; "unwavering loyalty"