Steadfast means firmly loyal and unchanging, even when things get difficult. A steadfast friend stands by you during tough times and when everything's going well. A steadfast commitment means you keep your promise even when it becomes harder than you expected.

Think of a lighthouse that stands steadfast through storms, waves crashing against it but never moving from its spot. That's the feeling of steadfastness: reliable, unshakable, constant.

You might admire someone's steadfast dedication to learning piano, practicing every day for years even when progress feels slow. A steadfast belief is one you hold onto through doubt and challenge. Scientists remain steadfast in following evidence wherever it leads, even when results surprise them.

The word suggests something admirable: the strength to stick with what matters when sticking with it takes courage, rather than stubbornness or refusing to learn. Being steadfast means you're someone others can count on, someone who doesn't abandon principles, people, or goals just because the path gets rocky.