Undying means lasting forever or never ending. When something is undying, it continues without fading or stopping, no matter how much time passes.

The word appears most often with feelings and commitments. A grandmother might have undying love for her grandchildren: a love that nothing could weaken or destroy. A dedicated scientist might pursue knowledge with undying curiosity, always asking questions no matter how many answers she finds. Friends might pledge undying loyalty to each other, promising to stand together through good times and bad.

Undying suggests something permanent and unshakeable. Your interest in video games might fade after a few months, but if you have an undying passion for drawing, you'll still love it years from now, even when it's challenging or frustrating. An undying quality persists through difficulties and changes, maintaining its strength over time.

The word literally means “not dying,” which is why it works so well for describing things like hope, determination, or devotion. These aren't physical objects that can break or wear out. They're feelings and commitments that can last a very long time if you keep them alive.