unswerving

(s) 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
undeviating,
(s) firm and dependable especially in loyalty
- a steadfast ally
- a staunch defender of free speech
- unswerving devotion
- unswerving allegiance
staunch, steadfast,

undeviating staunch steadfast

unswervingly