EN unfaltering
volume_up
{adjective}

1. "voice"

unfaltering (also: taut, unshaken, decisive, definite)
volume_up
firme {adj.}

2. "steps"

unfaltering (also: strong-minded, decided, distinct, go-ahead)

3. "confidence, optimism"

Synonyms (English) for "unfaltering":

unfaltering
faltering