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

1.
constancia, fidelidad, estabilidad
the quality of being unchanging or steadfast; faithfulness
:
•
Her constancy in friendship was admirable.
Su constancia en la amistad era admirable.
•
The constancy of the stars in the night sky is a comforting thought.
La constancia de las estrellas en el cielo nocturno es un pensamiento reconfortante.