saturated

An object or substance that can't absorb any more liquid because its molecules are already tightly packed is saturated. Think of a sponge filled with water and no room left for it to soak up more.

When people talk about something being saturated, they usually mean it's been overfilled or overwhelmed by something else, like water in the case of a sponge. This can be a bit abstract because we often think of saturation happening with liquids, but imagine a social media platform getting so many new users that it slows down and can't handle any more - that's a kind of saturation too. Or consider a city reaching its maximum capacity for housing or traffic - people might say the area is saturated with residents or cars. In all these cases, something has been taken up to its limit and can't take on anything else.