hard
Hard, loud, rough.
The mattress is full I believe
A king size mattress is 76 inches long and 80 inches wide. It is the second-biggest commercially available mattress size, behind the California king.
A mattress measuring 72x82 inches is classified as a "California King" size mattress. This size is typically 4 inches longer than a standard King mattress, which measures 76x80 inches. California Kings are ideal for taller individuals who need extra length for comfort.
When you sleep on a mattress, your body weight exerts a downward force on the mattress due to gravity. The mattress exerts an equal and opposite upward force on your body, providing support and keeping you from falling. These forces are internal to the system of you and the mattress.
The opposite of "Push hard" or a hard push is an easy or light push.
The opposite of rock-hard would be soft or flexible.
Someone got fecked hard on your bed and some of it soaked into the mattress.
The opposite of hard-working could be lazy, slothful, lethargic, or indolent.
If your futon mattress has a removable cover it can just be thrown in the wash for cleaning. Do not get the mattress very wet as it is hard to dry off. You can just blot off any stains on the mattress. Allow it to dry outdoors if possible vacuum to help dry it a bit faster.
Egg crate mattress can be good to sleep on. However, it has holes in it that will catch dirt and other stuff, making it hard to sleep on for some.
Soft
Its really hard to say which will last longer between a mattress and a matress pad. Since mattresses only have a lifespan of 5 to ten years typically I would say matress pads because they don't wear out like a mattress does.
If you mean hard as in the opposite of soft, then rigid, firm, adamatine. If you mean the opposite of easy, then difficult
hard
hard