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Illegal in Irish (neamhdhlíthiúil): Meaning, Forms, Examples

The Irish for illegal is neamhdhlíthiúil: gnó neamhdhlíthiúil, an illegal business.
Updated October 2026Report a mistake

How to say “illegal” in Irish

Irish:
neamhdhlíthiúil
English:
illegal
Word type:
adjective
More illegal:
níos neamhdhlíthiúla
Most illegal:
is neamhdhlíthiúla
Plural:
neamhdhlíthiúla
Pronunciation:
“NYOW-yleeh-ool”  /ˈnʲaũjlʲiːhuːlʲ/

What does “neamhdhlíthiúil” mean?

illegal
Not allowed by law; against the law.Also: unlawful, illicit, against the law.

Other Irish adjectives for illegal: mídhleathach (illegal), coiriúil (criminal), neamhdhleathach (illegal)

“Neamhdhlíthiúil” after a noun

An Irish adjective comes after its noun. Here is neamhdhlíthiúil after gnó (business, masculine), after gníomhaíocht (activity, feminine) and after a plural.

after a masculine noungnó neamhdhlíthiúilan illegal business
after a feminine noungníomhaíocht neamhdhlíthiúilan illegal activity
after a plural noungnóthaí neamhdhlíthiúlaillegal businesses

séimhiú (the h) the ending

plural
gnóthaíbusinesses
+
neamhdhlíthiúlaillegal, plural
=
gnóthaí neamhdhlíthiúlaillegal businesses

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

More illegal, most illegal, very illegal

níosmore
+
neamhdhlíthiúlaillegal
=
níos neamhdhlíthiúlamore illegal
ismost
+
neamhdhlíthiúlaillegal
=
is neamhdhlíthiúlamost illegal
more illegalníos neamhdhlíthiúlain the past tense: ní ba neamhdhlíthiúla
most illegalis neamhdhlíthiúlain the past tense: ba neamhdhlíthiúla
as illegal aschomh neamhdhlíthiúil leno change after chomh
very illegalan-neamhdhlíthiúilan- lenites, except d, t and s
too illegalróneamhdhlíthiúilró- lenites

“Neamhdhlíthiúil” in a sentence: Irish examples

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

Dúnadh an gnó neamhdhlíthiúil sin anuraidh.
That illegal business was closed last year.
Fuarthas arm neamhdhlíthiúil sa teach.
An illegal weapon was found in the house.
Gabhadh iad as drugaí neamhdhlíthiúla a dhíol.
They were arrested for selling illegal drugs.
Tá sé neamhdhlíthiúil tobac a dhíol le páistí.
It is illegal to sell tobacco to children.
Tá sé neamhdhlíthiúil tiomáint gan árachas.
It is illegal to drive without insurance.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Illegal in Irish: frequently asked questions

What is the Irish for illegal?

The Irish for illegal is neamhdhlíthiúil (pronounced “NYOW-yleeh-ool”). It comes after the noun: gnó neamhdhlíthiúil, an illegal business; gníomhaíocht neamhdhlíthiúil, an illegal activity.

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

níos neamhdhlíthiúla is more illegal and is neamhdhlíthiúla is most illegal. In the past tense they become ní ba neamhdhlíthiúla and ba neamhdhlíthiúla.

What is the plural of neamhdhlíthiúil?

With a plural noun neamhdhlíthiúil becomes neamhdhlíthiúla: gnóthaí neamhdhlíthiúla, gníomhaíochtaí neamhdhlíthiúla.

How do you say very illegal in Irish?

an-neamhdhlíthiúil. Too illegal is róneamhdhlíthiúil, and as illegal as is chomh neamhdhlíthiúil le.

What is the difference between 'neamhdhlíthiúil' and 'mídhleathach'?

Both mean illegal. 'Mídhleathach' and 'neamhdhleathach' are very common in legal and official Irish, while 'neamhdhlíthiúil' is also widely used, for example 'drugaí neamhdhlíthiúla'.

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