undyingly

/ʌnˈdaɪɪŋli/
adverb
  1. In a way that lasts forever or never fades; eternally.
    • They promised to love each other undyingly.
    • She was undyingly loyal to her friends through every hardship.
    • The soldier was undyingly devoted to his country.
Antonyms
What does "undyingly" mean? | whatsthatwordmean | whatsthatwordmean