Main entry: steadfast, unswerving, staunch
Definition: firm and dependable especially in loyalty
Usage: a steadfast ally; a staunch defender of free speech; unswerving devotion; unswerving allegiance
Main entry: undeviating, unswerving
Definition: going directly ahead from one point to another without veering or turning aside
Usage: 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