Those who say [unvalidated][1] *(never having been validated)* is "not a word" are simply being prescriptive, outdated, and pedantic. It's been used increasingly [over the past century][2] (the chart represents a total of 34,000 instances in print).

![enter image description here][3]

I don't see any problem at all with the word, which is clearly distinguishable from [invalidated][4] *(having been been checked but failed validation)*. If OP wishes to avoid unfounded allegations of illiteracy though, he might wish to consider [unverified][5] as a less contentious alternative.


  [1]: http://en.wiktionary.org/wiki/unvalidated
  [2]: http://books.google.com/ngrams/graph?content=unvalidated&year_start=1920&year_end=2000&corpus=0&smoothing=3
  [3]: https://i.sstatic.net/MBHfZ.png
  [4]: http://www.merriam-webster.com/dictionary/invalidated
  [5]: http://www.merriam-webster.com/dictionary/unverified