conna

• cona
• coná, conná (in some editions, on the assumption that the a was long)

Univerbation of co (“so that”, nasalizing) +‎ ná (“not”)

• IPA^(key): [ˈkon͈a]

conna (abbreviated ɔna)

1. so that…not, lest

   Synonym: coní

   • c. 800–825, Diarmait, Milan Glosses on the Psalms, published in Thesaurus Palaeohibernicus (reprinted 1987, Dublin Institute for Advanced Studies), edited and with translations by Whitley Stokes and John Strachan, vol. I, pp. 7–483, Ml. 27^c4

     Ɔna tíssed etir in dígal; níba samlid insin, acht du·fïastar tra cenn-som.

     So that the punishment should not come at all; that will not be so, but punishment will be inflicted because of them.

• G. Toner, M. Ní Mhaonaigh, S. Arbuthnot, D. Wodtko, M.-L. Theuerkauf, editors (2019), “3 co”, in eDIL: Electronic Dictionary of the Irish Language
• Thurneysen, Rudolf (1940, reprinted 2017) D. A. Binchy and Osborn Bergin, transl., A Grammar of Old Irish, Dublin Institute for Advanced Studies, →ISBN, § 896, pages 554–55