"blunt object" is correct and usable in written English.
You can use it when referring to an object or tool that is not sharp or pointed, but rather round and dull. For example, "She hit him with a heavy, blunt object."
He describes Kocur's hand as "a blunt object with fingernails".
I would have murdered them in their beds with the nearest available blunt object".
Another 17-year-old was hit on the head with a blunt object, the police said.
A blunt object was used but no other details were given.
Prosecutors said she was bludgeoned by a blunt object, but no murder weapon was ever recovered.
Break into small pieces with a blunt object such as a rolling pin and store in an airtight container.
The police said Mr. Gibbs had also been struck with a blunt object on the back of his head.
The men in the car jumped out and beat Mr. Garzon with a blunt object, fracturing his skull.
"Kill me quickly, I beg you — hit me with a blunt object, anything," were his last, moving words.
He was attacked as he locked up to leave, struck on the neck with a blunt object.
Instead, the blunt object that is Chris is hanging out with Seth and learning all about zombies.
