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Thick fog in Irish (Dallcheo): Meaning, Pronunciation, Usage

‘dallcheo’ also means: confusion

The Irish for thick fog is dallcheo, a masculine noun.
Updated October 2026Report a mistake

How to say “thick fog” in Irish

Irish:
dallcheo
English:
thick fog, confusion
Word type:
noun
Gender:
masculine
Pronunciation:
“DAL-khyoh”  /ˈd̪ˠal̪ˠˌçoː/
Various forms
Genitive singular:
dallcheo, an dallcheo (e.g. i lár an dallcheo, in the middle of the thick fog)

What does “dallcheo” mean?

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

thick fog
A dense, blinding fog or mist through which you can hardly see anything.Also: dense fog, blinding mist, pea-souper, fog.
1 other meaning: confusion
2confusion
A state of mental fog or bewilderment, where a person cannot think or see clearly.Also: daze, bewilderment, mental fog.

Other Irish words for thick fog: tromcheo (dense fog)

“Dallcheo” with the article

Here is dallcheo after the article (an t-alt).

an dallcheo
the thick fog
No change after an

“Dallcheo” in a sentence: Irish examples

Common Irish sentences using dallcheo, the Irish word for thick fog.

Bhí dallcheo ar an sliabh ar maidin.
There was thick fog on the mountain this morning.
Níor éirigh an dallcheo go meán lae.
The thick fog didn't lift until midday.
Chuamar amú sa dallcheo.
We got lost in the dense fog.
Ní raibh radharc ar bith againn de bharr an dallcheo.
We had no visibility at all because of the thick fog.
Thiomáin sé go mall tríd an dallcheo.
He drove slowly through the thick fog.
Tá dallcheo ar m'intinn inniu.
My mind is in a fog today.
Tháinig dallcheo isteach ón bhfarraige.
A thick fog came in from the sea.

Other nouns in Irish

More everyday Irish nouns to learn next.

Thick fog in Irish: frequently asked questions

What is the Irish for thick fog?

The Irish for thick fog is dallcheo (pronounced “DAL-khyoh”). It’s a masculine noun. Depending on context it can also mean confusion.

How do you pronounce dallcheo in Irish?

Dallcheo is said like “DAL-khyoh” (IPA /ˈd̪ˠal̪ˠˌçoː/).

Does dallcheo have a plural?

No plural form is given for dallcheo in the standard. Many abstract and mass nouns in Irish have no plural.

Does dallcheo have more than one meaning?

Yes. Dallcheo can mean thick fog or confusion, depending on context; the first is the most common.

Why does dallcheo change to dhallcheo or ndallcheo?

Irish changes the start of some words after certain words. After mo (my) dallcheo becomes mo dhallcheo (lenition), and after ár (our) or i (in) it becomes ár ndallcheo (eclipsis).

How is 'dallcheo' different from 'ceo'?

'Ceo' is ordinary fog or mist, while 'dallcheo' (from 'dall', blind, plus 'ceo') is a fog so thick it blinds you. 'Ceobhrán' is a light drizzly mist.

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