Latino sine flexione is a variant of Latin created by Peano in 1903. As far as I know it was used in scientific literature but since forgotten.

I found this site and a few discussions on Duolingo but not a single speaker. A quite complete grammar can be found here.

Is this wonderful project dead?

Note: I posted the same question here and was suggested to "address a different community".

  • First I was - hm, what - I've never heard about it, than I've opened Wiki and realized that it's Interlingua ) but it shouldn't be confuse with the other, more famous Interlingua )
    – shabunc
    Oct 31, 2019 at 20:22
  • It is Interlingua de Peano that is different from Interlingua that you may think of.
    – user966
    Oct 31, 2019 at 20:23
  • no, I'm aware that there are two, I meant this one exactly. Never liked it though )
    – shabunc
    Oct 31, 2019 at 20:24
  • For what reason?
    – user966
    Oct 31, 2019 at 20:26
  • it's basically a Latin without cases and conjugations. As a native Russian speaker who learnt Latin in school LSF sounded compared to Latin like a Bulgarian to Russian - similar but "frozen".
    – shabunc
    Oct 31, 2019 at 20:28

1 Answer 1


It is obviously not completely dead, there is at least one blogger posting short news items in Latino Sine Flexione here http://nuntios.blogspot.com/search/label/Latino%20sine%20Flexione

I don't know whether there is a functional speech community for this language left.

EDIT: There is another life sign of Latino sine flexione: Someone created a LaTeX package for it!

  • Thank you for sharing the blog!
    – user966
    May 10, 2019 at 17:11
  • As an adjunct to this answer, I came across what I think must be LSF in a Duolingo forum. Sòmebody out there is using LSF!
    – elemtilas
    May 15, 2019 at 11:41
  • I am working on its revival: acproil.github.io :)
    – user966
    Jan 7, 2020 at 16:06

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