-adh

• -eadh (slender form)

From Old Irish -ad, from the thematic vowel of the various verb stems + Proto-Celtic *-tus.

• (Munster, Galway) IPA^(key): /ə/
• (Mayo) IPA^(key): /uː/
• (Ulster) IPA^(key): /u/

-adh m (genitive singular -ta)

1. Creates the regular verbal noun of first-conjugation verbs.

• May be used as a noun, which then decline as third-declension masculine nouns (which may or may not have a plural):

  ‎mol (“praise”, verb) + ‎-adh → ‎moladh m (“praise”, noun)

• -ú

From Old Irish -ad, from the thematic vowel of the various verb stems + Proto-Celtic *-to.

• (Munster) IPA^(key): /əɡ/
• (Galway) IPA^(key): /əvˠ/
• (Mayo) IPA^(key): /uː/
• (Ulster) IPA^(key): /u/

-adh

1. Autonomous ending of first-conjugation verbs in the past indicative tense.

• -aíodh (second-conjugation broad form)
• -íodh (second-conjugation slender form)

From Old Irish -ad, from the thematic vowel of the various verb stems + Proto-Celtic *-to.

• (Munster) IPA^(key): /əx/
• (Galway) IPA^(key): (before sé, sí, sibh, siad) /ətʲ/, (elsewhere) /əx/
• (Mayo) IPA^(key): (before sé, sí, sibh, siad) /ətʲ/, (elsewhere) /uː/
• (Ulster) IPA^(key): (before sé, sí, sibh, siad) /ətʲ/, (elsewhere) /u/

-adh

1. Analytic ending of first-conjugation verbs in the past habitual tense
2. Analytic ending of first-conjugation verbs in the past subjunctive mood
3. Third-person singular ending of first-conjugation verbs in the imperative mood

• -ódh (second-conjugation broad form)
• -eodh (second-conjugation slender form)