HeyRua Get the app

Radical in Irish (Radacach): Meaning, Pronunciation, Usage

The Irish for radical is radacach, a masculine noun (plural radacaigh).
Updated October 2026Report a mistake

How to say “radical” in Irish

Irish:
radacach
English:
radical
Word type:
noun
Gender:
masculine
Pronunciation:
“RAD-uh-kukh”  /ˈɾˠad̪ˠəkəx/
Various forms
Plural:
radacaigh (radicals)
Genitive singular:
radacaigh, an radacaigh (e.g. tuairimí an radacaigh, the radical's opinions)
Genitive plural:
radacach, na radacach (e.g. tuairimí na radacach, the views of the radicals)

What does “radacach” mean?

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

radical
A person who holds radical political views and wants fundamental change in society.Also: extremist, political radical.
1 other meaning:
2radical
In chemistry, a group of atoms that behaves as a single unit in reactions, such as a free radical.Also: free radical, chemical radical.

“Radacach” with the article

The plural of radical in Irish is radacaigh. Here is radacach after the article (an t-alt), in the singular and the plural.

an radacach
the radical
No change after an
na radacaigh
the radicals
Plural: no change after na

“Radacach” in a sentence: Irish examples

Common Irish sentences using radacach, the Irish word for radical.

Radacach a bhí ann nuair a bhí sé óg.
He was a radical when he was young.
Labhair an radacach go láidir ag an gcruinniú.
The radical spoke forcefully at the meeting.
Níor aontaigh mé le tuairimí an radacaigh.
I didn't agree with the radical's views.
Bhí go leor radacach sa pháirtí sin.
There were plenty of radicals in that party.
Tháinig na radacaigh le chéile i mBaile Átha Cliath.
The radicals gathered in Dublin.
Thug an rialtas aghaidh ar na radacaigh.
The government confronted the radicals.
Is radacach saor é an móilín seo.
This molecule is a free radical.

Other nouns in Irish

More everyday Irish nouns to learn next.

Radical in Irish: frequently asked questions

What is the Irish for radical?

The Irish for radical is radacach (pronounced “RAD-uh-kukh”). It’s a masculine noun and the plural is radacaigh.

How do you pronounce radacach in Irish?

Radacach is said like “RAD-uh-kukh” (IPA /ˈɾˠad̪ˠəkəx/).

What is the plural of radical in Irish?

The plural of radacach is radacaigh; with the article, na radacaigh means “the radicals”. The genitive plural is radacach, as in tuairimí na radacach (the views of the radicals).

Is 'radacach' also an adjective?

Yes, 'radacach' is also the adjective 'radical', as in 'athrú radacach' (a radical change); as a noun it means a radical person or a chemical radical.

What is the difference between 'radacach' and 'antoisceach'?

'Radacach' is someone who wants fundamental change, while 'antoisceach' means an extremist and is more negative.

Learn Irish by
actually speaking it

Learn everyday Irish words like radacach through guided conversation with Rua.

7-day free trial. Cancel anytime.

The HeyRua app home screen