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Mystery in Irish (Mistéir): Meaning, Pronunciation, Usage

The Irish for mystery is mistéir, a feminine noun (plural mistéirí).
Updated October 2026Report a mistake

How to say “mystery” in Irish

Irish:
mistéir
English:
mystery
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“mish-TAY-ir”  /mʲɪˈʃtʲeːrʲ/
Various forms
Plural:
mistéirí (mysteries)
Genitive singular:
mistéire, na mistéire (e.g. réiteach na mistéire, the solution of the mystery)
Genitive plural:
mistéirí, na mistéirí (e.g. réiteach na mistéirí, the solving of the mysteries)

What does “mistéir” mean?

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

mystery
Something strange or hidden that is hard or impossible to understand or explain.Also: enigma, puzzle, secret.
1 other meaning:
2mystery
A religious truth or sacred rite that cannot be fully understood by reason, such as a mystery of the rosary.Also: religious mystery, sacred mystery.

Other Irish words for mystery: rún (secret), rúndiamhair (mystery)

“Mistéir” with the article

The plural of mystery in Irish is mistéirí. Here is mistéir after the article (an t-alt), in the singular and the plural.

an mhistéir
the mystery
Lenition: m becomes mh after an (feminine noun)
na mistéirí
the mysteries
Plural: no change after na

“Mistéir” in a sentence: Irish examples

Common Irish sentences using mistéir, the Irish word for mystery.

Is mistéir dom é go fóill.
It is still a mystery to me.
Níor réitíodh an mhistéir riamh.
The mystery was never solved.
Bhí na póilíní ag iarraidh bun na mistéire a fháil.
The police were trying to get to the bottom of the mystery.
Tá a lán mistéirí sa domhan seo.
There are many mysteries in this world.
Deirtear mistéirí an phaidrín gach oíche.
The mysteries of the rosary are said every night.
Is mistéir é cá ndeachaigh sé.
Where he went is a mystery.
Tá rud éigin sa mhistéir seo nach dtuigim.
There is something in this mystery I don't understand.

Other nouns in Irish

More everyday Irish nouns to learn next.

Mystery in Irish: frequently asked questions

What is the Irish for mystery?

The Irish for mystery is mistéir (pronounced “mish-TAY-ir”). It’s a feminine noun and the plural is mistéirí.

How do you pronounce mistéir in Irish?

Mistéir is said like “mish-TAY-ir” (IPA /mʲɪˈʃtʲeːrʲ/).

What is the plural of mystery in Irish?

The plural of mistéir is mistéirí; with the article, na mistéirí means “the mysteries”. The genitive plural is mistéirí, as in réiteach na mistéirí (the solving of the mysteries).

Why does mistéir change to mhistéir?

After words like mo (my) and do (your) the first letter is lenited: mo mhistéir. After ár (our) it stays ár mistéir, because m does not take eclipsis.

What is the difference between mistéir and rúndiamhair?

Both mean mystery; rúndiamhair is the more native word, often used in religious contexts, while mistéir is common in everyday speech and for detective stories.

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