The word 'stillness' is a noun, a word for a lack of motion or a lack of sound; a word for a thing.
A noun functions as the subject of a sentence or a clause, and as the object of a verb or a preposition.
Examples:
The stillness of the lake in the early morning is so calming.
I enjoy reading on the patio which the stillness there permits.
The sound of crickets filled the stillness of the night.
We're grateful for the stillness when the children are finally asleep.
The guy still had plenitude
I still have to bring in the laundry.
There is still a glimmer of hope.
How can you use unbelievable in a sentence?
Still water runs deep. The ice cubes are still water.
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No
An alchemist still relies on chemistry.
I am still searching for a reference point.
The laws were still on on the books but had fallen in desuetude.
He painted the window still.
His logic is infallible, but I still don't believe it.