Constancy – Quality of being unchanging/faithful

To remember the definition of the word constancy, use the following mnemonic:

She was constantly at sea (constancy). Even if you pleaded with her to come on to land, she was unchanging and faithful to the sea.

Examples of constancy in a sentence

Thanks to his constancy, Keith is the kind of guy that everyone loves for being dependable.

I wish I could say my sister was known for her constancy, but she rarely keeps her promises.

The constancy of my friend Marge makes me feel that I can always count on her, no matter what.