andach

Old Irish

an- (“un-”) +‎ dag (“good”), from Proto-Celtic *dagos (“good”). Cognate with early Proto-Brythonic andagin (accusative singular feminine) (later *andaɣ), found in the Bath curse tablets.

andach n (genitive andaig, nominative plural andach)

wickedness, iniquity
- 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. 134^d3
  Ɔ·riris-siu .i. ar·troídfe{a}-siu inna droch daíni, a Dǽ, dia n‑anduch, air is fechtnach a n‑andach mani erthroítar húa Día.
  You will bind, i.e. you will restrain the evil people, O God, from their iniquity, for their iniquity is prosperous if they are not restrained by God.

Neuter o-stem
	Singular	Dual	Plural
Nominative	andach^N	andach^N	andach^L, andga
Vocative	andach^N	andach^N	andach^L, andga
Accusative	andach^N	andach^N	andach^L, andga
Genitive	andaig^L	andach	andach^N
Dative	anduch^L	andgaib	andgaib
Initial mutations of a following adjective: ^H = triggers aspiration ^L = triggers lenition ^N = triggers nasalization

Old Irish mutation
Radical	Lenition	Nasalization
andach (pronounced with /h/ in h-prothesis environments)	unchanged	n-andach
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.