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To swear in Irish (mionnaigh): Meaning, Conjugation, Examples

Other uses of ‘mionnaigh’: swear in

The Irish for to swear is mionnaigh; ag mionnú is swearing.
Updated October 2026Report a mistake

How to say “to swear” in Irish

Irish:
mionnaigh
English:
to swear, swear in
Word type:
verb, second-conjugation
Verbal noun:
mionnú (ag mionnú, swearing)
Verbal adjective:
mionnaithe
Pronunciation:
“MYUN-ee”  /ˈmʲʊnˠiː/

What does “mionnaigh” mean?

“Mionnaigh” has two alternative meanings. The most common comes first.

to swear
To make a solemn promise or declaration under oath.Also: take an oath, vow, swear an oath.
1 other meaning: swear in
2to swear in
To formally put someone under oath, for example a witness or an official.Also: administer an oath, put under oath.

Other Irish verbs for to swear: eascainigh (curse)

“Mionnaigh” in the different tenses

Every form follows An Caighdeán Oifigiúil.

Aimsir Chaite (Past)

PersonPositiveNegativeQuestion
mé (I)Mhionnaigh méI sworeNíor mhionnaigh méI did not swearAr mhionnaigh mé?Did I swear?
tú (you)Mhionnaigh túYou sworeNíor mhionnaigh túYou did not swearAr mhionnaigh tú?Did you swear?
sé / sí (he / she)Mhionnaigh sé / síHe sworeNíor mhionnaigh sé / síHe did not swearAr mhionnaigh sé / sí?Did he swear?
sinn (we)MhionnaíomarWe sworeNíor mhionnaíomarWe did not swearAr mhionnaíomar?Did we swear?
sibh (you, plural)Mhionnaigh sibhYou sworeNíor mhionnaigh sibhYou did not swearAr mhionnaigh sibh?Did you swear?
siad (they)Mhionnaigh siadThey sworeNíor mhionnaigh siadThey did not swearAr mhionnaigh siad?Did they swear?
saorbhriathar (autonomous)MionnaíodhNíor mionnaíodhAr mionnaíodh?

Aimsir Láithreach (Present)

PersonPositiveNegativeQuestion
mé (I)MionnaímI swearNí mhionnaímI do not swearAn mionnaím?Do I swear?
tú (you)Mionnaíonn túYou swearNí mhionnaíonn túYou do not swearAn mionnaíonn tú?Do you swear?
sé / sí (he / she)Mionnaíonn sé / síHe swearsNí mhionnaíonn sé / síHe does not swearAn mionnaíonn sé / sí?Does he swear?
sinn (we)MionnaímidWe swearNí mhionnaímidWe do not swearAn mionnaímid?Do we swear?
sibh (you, plural)Mionnaíonn sibhYou swearNí mhionnaíonn sibhYou do not swearAn mionnaíonn sibh?Do you swear?
siad (they)Mionnaíonn siadThey swearNí mhionnaíonn siadThey do not swearAn mionnaíonn siad?Do they swear?
saorbhriathar (autonomous)MionnaítearNí mhionnaítearAn mionnaítear?

Aimsir Fháistineach (Future)

PersonPositiveNegativeQuestion
mé (I)Mionnóidh méI will swearNí mhionnóidh méI will not swearAn mionnóidh mé?Will I swear?
tú (you)Mionnóidh túYou will swearNí mhionnóidh túYou will not swearAn mionnóidh tú?Will you swear?
sé / sí (he / she)Mionnóidh sé / síHe will swearNí mhionnóidh sé / síHe will not swearAn mionnóidh sé / sí?Will he swear?
sinn (we)MionnóimidWe will swearNí mhionnóimidWe will not swearAn mionnóimid?Will we swear?
sibh (you, plural)Mionnóidh sibhYou will swearNí mhionnóidh sibhYou will not swearAn mionnóidh sibh?Will you swear?
siad (they)Mionnóidh siadThey will swearNí mhionnóidh siadThey will not swearAn mionnóidh siad?Will they swear?
saorbhriathar (autonomous)MionnófarNí mhionnófarAn mionnófar?

Modh Coinníollach (Conditional)

PersonPositiveNegativeQuestion
mé (I)MhionnóinnI would swearNí mhionnóinnI would not swearAn mionnóinn?Would I swear?
tú (you)MhionnófáYou would swearNí mhionnófáYou would not swearAn mionnófá?Would you swear?
sé / sí (he / she)Mhionnódh sé / síHe would swearNí mhionnódh sé / síHe would not swearAn mionnódh sé / sí?Would he swear?
sinn (we)MhionnóimisWe would swearNí mhionnóimisWe would not swearAn mionnóimis?Would we swear?
sibh (you, plural)Mhionnódh sibhYou would swearNí mhionnódh sibhYou would not swearAn mionnódh sibh?Would you swear?
siad (they)MhionnóidísThey would swearNí mhionnóidísThey would not swearAn mionnóidís?Would they swear?
saorbhriathar (autonomous)MhionnófaíNí mhionnófaíAn mionnófaí?

“Mionnaigh” in a sentence: Irish examples

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

Mhionnaigh an finné go raibh sé ag insint na fírinne.
The witness swore that he was telling the truth.
Mionnaíonn sí gach uair nach ndéanfaidh sí arís é.
She swears every time that she won't do it again.
Mionnóidh an t-uachtarán nua amárach.
The new president will take the oath tomorrow.
Mhionnóinn air sin dá mbeadh orm.
I would swear to that if I had to.
Níor mhionnaigh sé riamh in aghaidh a dhearthár.
He never swore against his brother.
Ar mhionnaigh tú é sin os comhair na cúirte?
Did you swear that in front of the court?

Other verbs in Irish

More everyday Irish verbs to learn next.

To swear in Irish: frequently asked questions

What is the Irish for to swear?

The Irish for to swear is mionnaigh (pronounced “MYUN-ee”). It is a second-conjugation verb; the verbal noun is mionnú.

What is the verbal noun of mionnaigh?

The verbal noun of mionnaigh is mionnú, used after ag for the continuous: ag mionnú (swearing). The verbal adjective is mionnaithe.

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

Past: Mhionnaigh mé; negative Níor mhionnaigh mé; question Ar mhionnaigh mé?. Future: Mionnóidh mé; negative Ní mhionnóidh mé; question An mionnóidh mé?.

What is the modh coinníollach of mionnaigh?

The conditional (modh coinníollach) first person is Mhionnóinn (I would swear); negative Ní mhionnóinn; question An mionnóinn?.

Does mionnaigh have more than one meaning?

Yes. Mionnaigh can mean to swear or to swear in, depending on context; the first is the most common.

Does 'mionnaigh' mean to swear as in using bad language?

No, 'mionnaigh' means to swear an oath. For cursing or bad language use 'eascainigh' or 'bheith ag eascainí'.

How do you say 'take an oath' in Irish?

You can use the verb 'mionnaigh' or the phrase 'mionn a thabhairt'.

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