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Reason in Irish (Réasún): Meaning, Pronunciation, Usage

‘réasún’ also means: sense · cause

The Irish for reason is réasún, a masculine noun (plural réasúin).
Updated October 2026Report a mistake

How to say “reason” in Irish

Irish:
réasún
English:
reason, sense, cause
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“RAY-soon”  /ˈɾˠeːsˠuːnˠ/
Various forms
Plural:
réasúin (reasons)
Genitive singular:
réasúin, an réasúin (e.g. ré an réasúin, the age of reason)
Genitive plural:
réasún, na réasún (e.g. cuid na réasún, some of the reasons)

What does “réasún” mean?

“Réasún” has three alternative meanings. The most common comes first.

reason
The ability of the mind to think clearly and logically.Also: reasoning, rationality, intellect.
2 other meanings: sense or cause
2sense
Reasonableness or good sense in what someone says or does.Also: reasonableness, common sense.
3cause
A justification or motive for doing something.Also: motive, justification, grounds.

Other Irish words for reason: fáth (reason)

“Réasún” with the article

The plural of reason in Irish is réasúin. Here is réasún after the article (an t-alt), in the singular and the plural.

an réasún
the reason
No change after an
na réasúin
the reasons
Plural: no change after na

“Réasún” in a sentence: Irish examples

Common Irish sentences using réasún, the Irish word for reason.

Níl réasún ar bith leis sin.
There's no sense in that at all.
Labhair sé le réasún.
He spoke reasonably.
Chaill sí a réasún leis an mbrón.
She lost her reason with grief.
Bhí réasúin mhaithe aige leis an gcinneadh.
He had good reasons for the decision.
Tá réasún leis an méid a deir sé.
There's sense in what he says.
Ní féidir réasún a chur ina cheann.
You can't make him see sense.
Tá sé thar réasún ar fad.
It's completely beyond reason.

Other nouns in Irish

More everyday Irish nouns to learn next.

Reason in Irish: frequently asked questions

What is the Irish for reason?

The Irish for reason is réasún (pronounced “RAY-soon”). It’s a masculine noun and the plural is réasúin. Depending on context it can also mean sense or cause.

How do you pronounce réasún in Irish?

Réasún is said like “RAY-soon” (IPA /ˈɾˠeːsˠuːnˠ/).

What is the plural of reason in Irish?

The plural of réasún is réasúin; with the article, na réasúin means “the reasons”. The genitive plural is réasún, as in cuid na réasún (some of the reasons).

Does réasún have more than one meaning?

Yes. Réasún can mean reason, sense or cause, depending on context; the first is the most common.

What is the difference between réasún and fáth?

Fáth and cúis are the usual words for 'the reason why' (cén fáth?), while réasún is more about reason as a faculty or good sense, as in 'le réasún'.

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