undeviating

adjectives

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, unswerving
used of values and principles; not subject to change; steady
"undeviating loyalty"
undeviating
is similar to
worthy of reliance or trust
"a reliable source of information"; "a dependable worker"
dependable, reliable