। ॥ ६७५ ॥
In plain words
Since there is no second thing anywhere, nothing can ever be marked off from it. It stands alone, and it carries no attributes — that is what nirguṇatva, attributelessness, means.
Close to the Sanskrit
Owing to the absence of any other real thing, there are never, at any time, any exclusions; 'alone, and attributeless' — thus attributelessness is defined.