"undeviating" 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. undeviating
used of values and principles not subject to change steady
"undeviating loyalty"
Source: WordNet® (An amazing lexical database of English)
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