díummusach

Old Irish

From díummus (“pride, arrogance”) (from dí- +‎ uss- +‎ mess) + -ach.

díummusach

proud, arrogant
- 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. 56^a22
  Nacham·indarbanar-sa fo chomt⟨h⟩ururasib inna ndíummassach.
  Let me not be expelled under the incursions of the proud.

o/ā-stem
Singular	Masculine	Feminine	Neuter
Nominative	díummusach	díummusach	díummusach
Vocative	díummusaig* díummusach**	díummusach
Accusative	díummusach	díummusaig
Genitive	díummusaig	díummusaige	díummusaig
Dative	díummusach	díummusaig	díummusach
Plural	Masculine	Feminine/neuter
Nominative	díummusaig	díummusacha
Vocative	díummusachu díummusacha†
Accusative	díummusachu díummusacha†
Genitive	díummusach
Dative	díummusachaib
Notes	modifying a noun whose vocative is different from its nominative *modifying a noun whose vocative is identical to its nominative † not when substantivized

Old Irish mutation
Radical	Lenition	Nasalization
díummusach	díummusach pronounced with /ð(ʲ)-/	ndíummusach
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.