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Poisonous in Irish (nimhiúil): Meaning, Forms, Examples

Other uses of ‘nimhiúil’: virulent

The Irish for poisonous is nimhiúil: beacán nimhiúil, a poisonous mushroom.
Updated October 2026Report a mistake

How to say “poisonous” in Irish

Irish:
nimhiúil
English:
poisonous, virulent
Word type:
adjective
More poisonous:
níos nimhiúla
Most poisonous:
is nimhiúla
Plural:
nimhiúla
Pronunciation:
“NIV-ool”  /ˈnʲɪvʲuːlʲ/

What does “nimhiúil” mean?

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

poisonous
Containing poison or able to harm or kill by poison.Also: toxic, venomous.
1 other meaning: virulent
2virulent
Bitter, spiteful or malicious in feeling or speech.Also: venomous, spiteful, malicious.

“Nimhiúil” after a noun

An Irish adjective comes after its noun. Here is nimhiúil after beacán (mushroom, masculine), after nathair (snake, feminine) and after a plural.

after a masculine nounbeacán nimhiúila poisonous mushroom
after a feminine nounnathair nimhiúila poisonous snake
after a plural nounbeacáin nimhiúlapoisonous mushrooms

séimhiú (the h) the ending

plural
beacáinmushrooms
+
nimhiúlapoisonous, plural
=
beacáin nimhiúlapoisonous mushrooms

With a plural noun the adjective takes its plural form, nimhiúla.

More poisonous, most poisonous, very poisonous

níosmore
+
nimhiúlapoisonous
=
níos nimhiúlamore poisonous
ismost
+
nimhiúlapoisonous
=
is nimhiúlamost poisonous

Tá an nathair seo níos nimhiúla ná an ceann eile. This snake is more poisonous than the other one.

more poisonousníos nimhiúlain the past tense: ní ba nimhiúla
most poisonousis nimhiúlain the past tense: ba nimhiúla
as poisonous aschomh nimhiúil leno change after chomh
very poisonousan-nimhiúilan- lenites, except d, t and s
too poisonousrónimhiúilró- lenites

“Nimhiúil” in a sentence: Irish examples

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

Ná hith an beacán nimhiúil sin.
Don't eat that poisonous mushroom.
Chonaic sé nathair nimhiúil sa choill.
He saw a poisonous snake in the wood.
Tá plandaí nimhiúla sa ghairdín.
There are poisonous plants in the garden.
Tá an nathair seo níos nimhiúla ná an ceann eile.
This snake is more poisonous than the other one.
Tá na caora sin nimhiúil.
Those berries are poisonous.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Poisonous in Irish: frequently asked questions

What is the Irish for poisonous?

The Irish for poisonous is nimhiúil (pronounced “NIV-ool”). It comes after the noun: beacán nimhiúil, a poisonous mushroom; nathair nimhiúil, a poisonous snake.

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

níos nimhiúla is more poisonous and is nimhiúla is most poisonous. In the past tense they become ní ba nimhiúla and ba nimhiúla.

What is the plural of nimhiúil?

With a plural noun nimhiúil becomes nimhiúla: beacáin nimhiúla, nathracha nimhiúla.

How do you say very poisonous in Irish?

an-nimhiúil. Too poisonous is rónimhiúil, and as poisonous as is chomh nimhiúil le.

Does nimhiúil have more than one meaning?

Yes. Nimhiúil can mean poisonous or virulent, depending on context; the first is the most common.

What is the difference between 'nimhiúil' and 'nimhneach'?

'Nimhiúil' mainly means poisonous or venomous, while 'nimhneach' usually means sore or painful, though it can also mean venomous or bitter.

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