constancy
US /ˈkɑːn.stən.si/
UK /ˈkɑːn.stən.si/

1.
忠誠, 堅定, 不變
the quality of being unchanging or steadfast; faithfulness
:
•
Her constancy in friendship was admirable.
她在友誼中的忠誠令人欽佩。
•
The constancy of the stars in the night sky is a comforting thought.
夜空中星星的恆定是一種令人欣慰的想法。