I came across the Esperantido Universal where reversion of stems (e.g., mega "big" ⁒ gema "small", -a is the adjective ending) is used to denote antonymy. Are there other conlangs using this unusual and un-naturalistic device?

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    Hmm interesting. Limited reversal, called metathesis, does occur in many languages and sometimes with a grammatical meaning, but not whole words.
    – curiousdannii
    Commented Mar 14, 2018 at 4:14
  • I thought there was a section in Mark Rosenfelder's Language Construction Kit setting forth a scheme in which the forms of a verb are distinguished (in part) by permutation; but can't now find it. Commented Apr 26, 2018 at 4:57
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    Ah here it is. Only the vowels move about. zompist.com/kebreni.htm#Verbs Commented Oct 15, 2018 at 19:16

1 Answer 1


Solresol actually reverses the syllable order of a word to denote an opposite meaning, though this occurrence is inconsistent through the creator's published dictionary. For example, fala means good, but lafa means bad, and falaredo means accessible, but dorelafa means inaccessible.

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