I am proofreading a document and the following sentence came up:

Unless the data is appended only, then we can assume the temporal sampling has changed.

What the writer is trying to say, is essentially the following:

Unless the modification made to the data only included appending new data, then we can assume that the temporal sampling has changed.

Is there a verb that I could use to describe the original data set only having data appended to it?

Something along the lines of:

Unless the data is only (suffixed, verb to describe adding data, ???)

The way it was written sounds as though the original data was appended to something else.

I hope that the question is clear. If possible I'd prefer a single word, however the most important thing is that the sentence is clear, so if need be I will simply rephrase it.

  • 'Unless the data in question is merely added as an appendix, ...' (It would be helpful to give the preceding context specifying what data.) Aug 9, 2021 at 16:17
  • Or, Unless the data is only modified by appending it, we can assume that… Note that in natural language we don't use then following unless; see e.g here. Aug 9, 2021 at 22:14
  • 1
    I'd be inclined to say "unless the data is only appended to, ...". Aug 9, 2021 at 23:35
  • I think your "trying to say" version was pretty good.
    – Hot Licks
    Aug 9, 2021 at 23:38

2 Answers 2


You can re-order the phrase so that unless joins the terms, like this:

We can assume the the temporal sampling has changed, unless the data is only appended to.


We can assume that the temporal sampling has altered unless the data alteration solely includes adding new data.

Is this alright?

  • 1
    Or this - Unless the data has been altered purely by appending new data, we can presume that the temporal sampling has changed. Aug 9, 2021 at 23:51

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