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Certain in Irish (dearfa): Meaning, Forms, Examples

Other uses of ‘dearfa’: proven

The Irish for certain is dearfa: fear dearfa, a certain man.
Updated October 2026Report a mistake

How to say “certain” in Irish

Irish:
dearfa
English:
certain, proven
Word type:
adjective
More certain:
níos dearfa
Most certain:
is dearfa
Pronunciation:
“JAR-fa”  /dʲaɾˠfˠə/

What does “dearfa” mean?

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

certain
Completely sure that something is true.Also: sure, positive, convinced.
1 other meaning: proven
2proven
Shown or confirmed to be true; affirmed.Also: proved, attested, confirmed.

Other Irish adjectives for certain: áirithe (certain), cinnte (sure), deimhin (certain), siúráilte (sure)

“Dearfa” after a noun

An Irish adjective comes after its noun. Here is dearfa after fear (man, masculine), after tuairim (opinion, feminine) and after a plural.

after a masculine nounfear dearfaa certain man
after a feminine nountuairim dhearfaa certain opinion
after a plural nounfir dhearfacertain men

séimhiú (the h) the ending

feminine
tuairimopinion
+
dearfacertain
=
tuairim dhearfaa certain opinion

After a feminine noun the adjective gets a séimhiú, an h after its first letter: tuairim dhearfa. After a masculine noun it stays as it is: fear dearfa.

plural
firmen
+
dearfacertain, plural
=
fir dhearfacertain men

With a plural noun the adjective takes its plural form, dearfa. It also gets an h after a plural that ends in a slender consonant: fir dhearfa; after other plurals it does not: tuairimí dearfa.

More certain, most certain, very certain

níosmore
+
dearfacertain
=
níos dearfamore certain
ismost
+
dearfacertain
=
is dearfamost certain

Tá mise níos dearfa ná tusa faoi sin. I am more certain than you about that.

more certainníos dearfain the past tense: ní ba dhearfa
most certainis dearfain the past tense: ba dhearfa
as certain aschomh dearfa leno change after chomh
very certainan-dearfaan- lenites, except d, t and s
too certainródhearfaró- lenites

“Dearfa” in a sentence: Irish examples

With a masculine noun, a feminine noun, a plural, a comparison and on its own.

An bhfuil tú dearfa faoi sin?
Are you sure about that?
Níl mé dearfa cén t-am a thosaíonn sé.
I'm not sure what time it starts.
Bhí na finnéithe dearfa faoina bhfaca siad.
The witnesses were certain about what they saw.
Tá mise níos dearfa ná tusa faoi sin.
I am more certain than you about that.
Tá mé dearfa go bhfuil sé ceart.
I am certain that he is right.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Certain in Irish: frequently asked questions

What is the Irish for certain?

The Irish for certain is dearfa (pronounced “JAR-fa”). It comes after the noun: fear dearfa, a certain man; tuairim dhearfa, a certain opinion.

How do you say more certain and most certain in Irish?

níos dearfa is more certain and is dearfa is most certain. In the past tense they become ní ba dhearfa and ba dhearfa.

Why does dearfa become dhearfa?

After a feminine singular noun an adjective is lenited: it gets an h after its first letter. So tuairim dhearfa (a certain opinion) but fear dearfa (a certain man), because fear is masculine.

How do you say very certain in Irish?

an-dearfa. Too certain is ródhearfa, and as certain as is chomh dearfa le.

Does dearfa have more than one meaning?

Yes. Dearfa can mean certain or proven, depending on context; the first is the most common.

What is the difference between 'dearfa' and 'dearfach'?

'Dearfa' means certain or sure, as in 'Tá mé dearfa de', while 'dearfach' means positive or affirmative, as in 'freagra dearfach'.

Which preposition goes with 'dearfa'?

Use 'de' for being sure of something, as in 'Tá mé dearfa de', or a clause with 'go', as in 'Tá mé dearfa go dtiocfaidh sé'.

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