Say, you have a sheet of paper. It is blank. I begin to write on it. It's no longer blank. But then what it is? I have tried the usual sources for antonyms but came up, well, blank.
If 'blank' means "The entire sheet is unmarked", then the opposite is "Some part of the sheet is touched", and the antonym is used or marked
If 'blank' means "The sheet is unfilled", then the opposite is "The entire sheet has been marked", and the antonym is full or filled in
The preferred natural antonym is the first; if you say "that sheet is not blank", the most likely inference is not that it is completely full but that it has at least some marks on it.
Well, Encarta says the antonym for blank is full … sort of (I guess) the way the fuel gauge on your car has empty and full on either spectrum.
Maybe once you start writing you could call it a partial [whatever you're putting into the sheet of paper].
A blank sheet of paper usually means a piece of paper that is clean, ready to be written on. If on the other hand we find a sheet that has something written on it we could say
- it's already been used / written on
- it's not clean
- it's been scribbled on
- there's something on it
A clean sheet can also be called a blank piece of paper but if it has been marked or soiled in some way we might say
- that's scrap paper
- it's dirty
- it's not spotless
- it's got smudges/stains/marks on it
If a blank piece of paper is taken to mean that it lacks information of some kind, that it has not been completed, its opposite would be