Adjective: undeviating ,ún'dee-vi,ey-ting
- 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";
- unswerving
- Used of values and principles; not subject to change; steady
"undeviating loyalty"
See also: dependable, direct, honest, reliable, true