How do you spell guniness?

"Guniness" is not a standard English word. It is likely a misspelling of one of the following:

* Guinness: This is the name of a famous Irish stout beer.

* Gunniness: This could be a word referring to a quality associated with someone named Gunn, or something related to a specific type of gun.

* Gunny: This is a slang term for a sack made of burlap.

To determine the correct spelling, you need more context. What were you trying to spell?