unchanging
adj. B2 Upper Intermediate US //ənˈtʃeɪndʒɪŋ// UK //ʌntʃˈeɪndʒɪŋ// un·chang·ing
adj. staying the same and never changing. You use this to describe things that are constant or do not vary over time.
adj. remaining in a constant state or condition; not subject to alteration or variation. Often used to describe abstract concepts like laws, traditions, or natural constants.
The stars in the night sky seem unchanging to us.
The small coastal village has an unchanging atmosphere, with the same shops and buildings standing for over a century.
While the technology of the era shifted rapidly, the fundamental principles of the law remained unchanging, providing a stable foundation for the new society.
From un- + changing.