1. [ adjective ] going directly ahead from one point to another without veering or turning aside
Synonyms: unswerving

"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"

Related terms: direct
2. [ adjective ] used of values and principles; not subject to change; steady

"undeviating loyalty"

Related terms: reliable
Similar spelling:   undefeated