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Viscous in Irish (slaodach): Meaning, Forms, Examples

Other uses of ‘slaodach’: sluggish

The Irish for viscous is slaodach: leacht slaodach, a viscous liquid.
Updated October 2026Report a mistake

How to say “viscous” in Irish

Irish:
slaodach
English:
viscous, sluggish
Word type:
adjective
More viscous:
níos slaodaí
Most viscous:
is slaodaí
Plural:
slaodacha
Pronunciation:
“SLAY-duch”  /ˈsl̪ˠeːd̪ˠəx/

What does “slaodach” mean?

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

viscous
Describes a liquid that is thick and flows slowly.Also: thick, sluggish, slow-flowing, syrupy.
1 other meaning: sluggish
2sluggish
Describes a person or thing that is slow, heavy and lazy in movement.Also: lethargic, languid, slow.

“Slaodach” after a noun

An Irish adjective comes after its noun. Here is slaodach after leacht (liquid, masculine), after ola (oil, feminine) and after a plural.

after a masculine nounleacht slaodacha viscous liquid
after a feminine nounola shlaodachviscous oil
after a plural nounleachtanna slaodachaviscous liquids

séimhiú (the h) the ending

feminine
olaoil
+
slaodachviscous
=
ola shlaodachviscous oil

After a feminine noun the adjective gets a séimhiú, an h after its first letter: ola shlaodach. After a masculine noun it stays as it is: leacht slaodach.

plural
leachtannaliquids
+
slaodachaviscous, plural
=
leachtanna slaodachaviscous liquids

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

More viscous, most viscous, very viscous

níosmore
+
slaodaíviscous
=
níos slaodaímore viscous
ismost
+
slaodaíviscous
=
is slaodaímost viscous

Tá mil níos slaodaí ná uisce. Honey is more viscous than water.

more viscousníos slaodaíin the past tense: ní ba shlaodaí
most viscousis slaodaíin the past tense: ba shlaodaí
as viscous aschomh slaodach leno change after chomh
very viscousan-slaodachan- lenites, except d, t and s
too viscousróshlaodachró- lenites

“Slaodach” in a sentence: Irish examples

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

Doirt sé leacht slaodach isteach sa phota.
He poured a viscous liquid into the pot.
Is ola shlaodach í seo.
This is a thick, viscous oil.
Bíonn leachtanna slaodacha deacair a dhoirteadh.
Viscous liquids are hard to pour.
Tá mil níos slaodaí ná uisce.
Honey is more viscous than water.
Tá an phéint seo an-slaodach.
This paint is very thick.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Viscous in Irish: frequently asked questions

What is the Irish for viscous?

The Irish for viscous is slaodach (pronounced “SLAY-duch”). It comes after the noun: leacht slaodach, a viscous liquid; ola shlaodach, viscous oil.

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

níos slaodaí is more viscous and is slaodaí is most viscous. In the past tense they become ní ba shlaodaí and ba shlaodaí.

Why does slaodach become shlaodach?

After a feminine singular noun an adjective is lenited: it gets an h after its first letter. So ola shlaodach (viscous oil) but leacht slaodach (a viscous liquid), because leacht is masculine.

What is the plural of slaodach?

With a plural noun slaodach becomes slaodacha: leachtanna slaodacha, olaí slaodacha.

How do you say very viscous in Irish?

an-slaodach. Too viscous is róshlaodach, and as viscous as is chomh slaodach le.

Does slaodach have more than one meaning?

Yes. Slaodach can mean viscous or sluggish, depending on context; the first is the most common.

What is the difference between 'slaodach' and 'tiubh'?

'Tiubh' is the everyday word for thick, while 'slaodach' specifically means viscous or slow-flowing, as in 'leacht slaodach', and is used in science.

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