saggy

An item that's saggy is droopy or hanging loosely, often because it's lost its shape or support.

You might hear people use this word when talking about their clothes. For example, someone might say, "I'm so tired of wearing these saggy socks, they're always slipping down." It could also be used to describe other things like a mattress that's sagging in the middle from too much weight, or even a face that looks tired and worn out. The word is often used informally, especially when people are chatting with friends or talking about everyday problems.