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Synonyms for Undeviating (same or very similar meaning)

WordNet sense 1 (going directly ahead from one point to another without veering or turning aside):

WordNet sense 2 (direct in spatial dimensions; proceeding without deviation or interruption; straight and short):

WordNet sense 3 (worthy of reliance or trust):
dependable, reliable

From the ODE community, based on WordNetadd/edit