What do you call a rocking chair if it is big, firm, and unlikely to fall suddenly? You'll feel safe if you sit in it, because nothing is going to happen with you.
I looked in Collins for words like:
Reliable People or things that are reliable can be trusted to work well or to behave in the way that you want them to.
I would call a man reliable, or a watch (as there are mechanism, supposed to work well), but I'm not sure, can I apply it to inanimate objects with no mechanisms.
Stable If something is stable, it is not likely to change or come to an end suddenly.
Steady If an object is steady, it is firm and does not shake or move about.
I'm not sure, can I call a rocking chair with both of that, because it's supposed to move, you know.
So, is there better word or some of the above works quite right?