Stable describes something that stays steady and doesn't change or wobble easily. A stable table doesn't tip over when you set your books on it. A stable ladder doesn't shake when you climb it. When something is stable, you can count on it to stay put and work reliably.

The word applies to situations and feelings too. A student with stable grades consistently earns similar scores, without wild swings between A's and F's. A person in a stable mood stays relatively calm and even-tempered rather than bouncing between extremes. Scientists talk about stable atoms that don't break apart easily, and engineers design stable bridges that can handle heavy traffic without swaying.

When things are stable, there's a sense of security and predictability. You know what to expect. A stable friendship is one that lasts through disagreements and changes. A stable community is one where people can build lives without constant upheaval.

The opposite of stable is unstable: shaky, unpredictable, likely to change or collapse. Notice how stability isn't the same as being stuck or boring. A stable foundation lets you build something lasting. A stable beginning gives you room to grow and take on new challenges with confidence.

As a noun, a stable is a building where horses are kept and cared for.