unvarying
/ˌʌnˈveɪəriŋ/Definitions
1. adjective
not changing or varying; constant or unchanging
“The unvarying temperature in the desert made it difficult for the travelers to adapt.”
2. noun
something that does not change or vary
“The unvarying rhythm of the song made it easy to remember.”
3. adverb
in a way that does not change or vary
“The flowers bloomed unvaryingly throughout the season.”