I’ve written before about the reflexive pronoun themself, showing its history in English and potential to fill a semantic gap in the language. Once a normal, unremarkable word, themself became less preferred over time, and its use today is low: Oxford Dictionaries says it’s “not widely accepted in standard English”, while Macmillan Dictionary says “most people consider this use incorrect”. Many dictionaries omit it.
This is a pity, but these are not permanent prescriptions – they’re observations about the usage’s current state of acceptability. And they are subject to change, because language is, because we are.
Themself is no mere quirky substitute for the more familiar pronoun themselves: it enables us to make subtle anaphoric distinctions. As my earlier post shows, there are situations where the use of themselves in place of themself would be misleading. By avoiding and stigmatising themself we miss a useful linguistic trick.