Synonyms for Undeviating (same or very similar meaning)
WordNet sense 1 (going directly ahead from one point to another without veering or turning aside):
unswervingWordNet sense 2 (direct in spatial dimensions; proceeding without deviation or interruption; straight and short):
directWordNet sense 3 (worthy of reliance or trust):
dependable, reliableFrom the ODE community, based on WordNetadd/edit