unchangingly

/ʌnˈtʃeɪndʒɪŋli/
adverb
  1. In a way that stays the same over time; without change or variation.
    • The old lighthouse stood unchangingly on the cliff, guiding ships for over a century.
    • She unchangingly wore the same silver necklace every day, a gift from her grandmother.
    • The desert landscape stretched unchangingly for miles, with no sign of life.