UNVARYING
uniform, unvarying
(adjective) always the same; showing a single form or character in all occurrences; “a street of uniform tall white buildings”
changeless, constant, invariant, unvarying
(adjective) unvarying in nature; “maintained a constant temperature”; “principles of unvarying validity”
unvaried, unvarying
(adjective) lacking variety
Source: WordNet® 3.1
Etymology
Adjective
unvarying (comparative more unvarying, superlative most unvarying)
persistent, constant, changeless
Synonyms: constant, nonchanging, unchanging, Thesaurus:changeless
lacking variety; having a uniform character
Synonyms: stable, Thesaurus:steady
Source: Wiktionary