-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, Ulster) IPA^(key): /uː/

-adh m (genitive singular -ta)

2. 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, Ulster) IPA^(key): /uː/

-adh

2. 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, Ulster) IPA^(key): (before sé, sí, sibh, siad) /ətʲ/^[1], (elsewhere) /uː/

-adh

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

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

• -eadh (slender form)

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

• (Hebrides, Lochaber, Kintyre) IPA^(key): /əɣ/
• (Ross-shire, West Inverness-shire, Arran) IPA^(key): /ək/
• (Mid Argyll) IPA^(key): /əv/
• (Sutherland, Tain area) IPA^(key): /ʊ/
• (South Lorn, Cowal) IPA^(key): /ə/

-adh

2. Regular verbal noun ending.

• 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)

• -aigeadh
• -ail
• -amh
• -ainn

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

• IPA^(key): /əɣ/

-adh

2. Autonomous ending of verbs in the past indicative tense
4. Analytic ending of verbs in the conditional tense
6. Third-person singular ending of verbs in the imperative mood