"unswerving" in the adjective sense
1. undeviating, unswerving
going directly ahead from one point to another without veering or turning aside
"some people see evolution as an undeviating upward march from simple organisms to the very complex"
"a straight and narrow tree-lined road unswerving across the lowlands"
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)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License