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To sin in Irish (peacaigh): Meaning, Conjugation, Examples

The Irish for to sin is peacaigh; ag peacú is sinning.
Updated October 2026Report a mistake

How to say “to sin” in Irish

Irish:
peacaigh
English:
to sin
Word type:
verb, second-conjugation
Verbal noun:
peacú (ag peacú, sinning)
Verbal adjective:
peacaithe
Pronunciation:
“PYAK-ee”  /pʲakˠə/

What does “peacaigh” mean?

to sin
To do something wrong against God or religious or moral law.Also: commit a sin, transgress, do wrong.

“Peacaigh” in the different tenses

Every form follows An Caighdeán Oifigiúil.

Aimsir Chaite (Past)

PersonPositiveNegativeQuestion
mé (I)Pheacaigh méI sinnedNíor pheacaigh méI did not sinAr pheacaigh mé?Did I sin?
tú (you)Pheacaigh túYou sinnedNíor pheacaigh túYou did not sinAr pheacaigh tú?Did you sin?
sé / sí (he / she)Pheacaigh sé / síHe sinnedNíor pheacaigh sé / síHe did not sinAr pheacaigh sé / sí?Did he sin?
sinn (we)PheacaíomarWe sinnedNíor pheacaíomarWe did not sinAr pheacaíomar?Did we sin?
sibh (you, plural)Pheacaigh sibhYou sinnedNíor pheacaigh sibhYou did not sinAr pheacaigh sibh?Did you sin?
siad (they)Pheacaigh siadThey sinnedNíor pheacaigh siadThey did not sinAr pheacaigh siad?Did they sin?
saorbhriathar (autonomous)PeacaíodhNíor peacaíodhAr peacaíodh?

Aimsir Láithreach (Present)

PersonPositiveNegativeQuestion
mé (I)PeacaímI sinNí pheacaímI do not sinAn bpeacaím?Do I sin?
tú (you)Peacaíonn túYou sinNí pheacaíonn túYou do not sinAn bpeacaíonn tú?Do you sin?
sé / sí (he / she)Peacaíonn sé / síHe sinsNí pheacaíonn sé / síHe does not sinAn bpeacaíonn sé / sí?Does he sin?
sinn (we)PeacaímidWe sinNí pheacaímidWe do not sinAn bpeacaímid?Do we sin?
sibh (you, plural)Peacaíonn sibhYou sinNí pheacaíonn sibhYou do not sinAn bpeacaíonn sibh?Do you sin?
siad (they)Peacaíonn siadThey sinNí pheacaíonn siadThey do not sinAn bpeacaíonn siad?Do they sin?
saorbhriathar (autonomous)PeacaítearNí pheacaítearAn bpeacaítear?

Aimsir Fháistineach (Future)

PersonPositiveNegativeQuestion
mé (I)Peacóidh méI will sinNí pheacóidh méI will not sinAn bpeacóidh mé?Will I sin?
tú (you)Peacóidh túYou will sinNí pheacóidh túYou will not sinAn bpeacóidh tú?Will you sin?
sé / sí (he / she)Peacóidh sé / síHe will sinNí pheacóidh sé / síHe will not sinAn bpeacóidh sé / sí?Will he sin?
sinn (we)PeacóimidWe will sinNí pheacóimidWe will not sinAn bpeacóimid?Will we sin?
sibh (you, plural)Peacóidh sibhYou will sinNí pheacóidh sibhYou will not sinAn bpeacóidh sibh?Will you sin?
siad (they)Peacóidh siadThey will sinNí pheacóidh siadThey will not sinAn bpeacóidh siad?Will they sin?
saorbhriathar (autonomous)PeacófarNí pheacófarAn bpeacófar?

Modh Coinníollach (Conditional)

PersonPositiveNegativeQuestion
mé (I)PheacóinnI would sinNí pheacóinnI would not sinAn bpeacóinn?Would I sin?
tú (you)PheacófáYou would sinNí pheacófáYou would not sinAn bpeacófá?Would you sin?
sé / sí (he / she)Pheacódh sé / síHe would sinNí pheacódh sé / síHe would not sinAn bpeacódh sé / sí?Would he sin?
sinn (we)PheacóimisWe would sinNí pheacóimisWe would not sinAn bpeacóimis?Would we sin?
sibh (you, plural)Pheacódh sibhYou would sinNí pheacódh sibhYou would not sinAn bpeacódh sibh?Would you sin?
siad (they)PheacóidísThey would sinNí pheacóidísThey would not sinAn bpeacóidís?Would they sin?
saorbhriathar (autonomous)PheacófaíNí pheacófaíAn bpeacófaí?

“Peacaigh” in a sentence: Irish examples

Past, present, future and conditional, with a negative and a question.

Pheacaigh sé go trom ina óige.
He sinned grievously in his youth.
Peacaíonn gach duine uair éigin.
Everyone sins at some time.
Ní pheacóidh mé arís, a Thiarna.
I will not sin again, Lord.
Pheacódh sé dá bhfaigheadh sé an deis.
He would sin if he got the chance.
Níor pheacaigh sí riamh ina saol.
She never sinned in her life.
Ar pheacaigh tú in aghaidh do chomharsan?
Did you sin against your neighbour?

Other verbs in Irish

More everyday Irish verbs to learn next.

To sin in Irish: frequently asked questions

What is the Irish for to sin?

The Irish for to sin is peacaigh (pronounced “PYAK-ee”). It is a second-conjugation verb; the verbal noun is peacú.

What is the verbal noun of peacaigh?

The verbal noun of peacaigh is peacú, used after ag for the continuous: ag peacú (sinning). The verbal adjective is peacaithe.

How do you say peacaigh in the past and the future?

Past: Pheacaigh mé; negative Níor pheacaigh mé; question Ar pheacaigh mé?. Future: Peacóidh mé; negative Ní pheacóidh mé; question An bpeacóidh mé?.

What is the modh coinníollach of peacaigh?

The conditional (modh coinníollach) first person is Pheacóinn (I would sin); negative Ní pheacóinn; question An bpeacóinn?.

Which preposition is used with 'peacaigh' to say who is sinned against?

Use 'in aghaidh': 'pheacaigh sé in aghaidh Dé', he sinned against God.

What is the noun for 'a sin'?

The noun is 'peaca', as in 'rinne sé peaca', he committed a sin.

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