steadfastness; adherence to principles

constancy; faithful adherence

निष्ठा; फलितबद्धता

English Usage: Their constance in their relationship was commendable.

Hindi Usage: उनके रिश्ते में उनकी निष्ठा प्रशंसनीय थी।

to persist or remain steadfast (archaic usage)

अडिग रहना

English Usage: She chose to constance through her difficulties.

Hindi Usage: उसने अपनी कठिनाइयों के माध्यम से अडिग रहने का चुनाव किया।