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Substantial in Irish (substaintiúil): Meaning, Forms, Examples

Other uses of ‘substaintiúil’: solid

The Irish for substantial is substaintiúil: méadú substaintiúil, a substantial increase.
Updated October 2026Report a mistake

How to say “substantial” in Irish

Irish:
substaintiúil
English:
substantial, solid
Word type:
adjective
More substantial:
níos substaintiúla
Most substantial:
is substaintiúla
Plural:
substaintiúla
Pronunciation:
“SUB-stan-chool”  /ˈsˠʊbˠsˠt̪ˠən̠ʲt̠ʲuːlʲ/

What does “substaintiúil” mean?

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

substantial
Large in amount, size or importance.Also: considerable, sizeable, significant.
1 other meaning: solid
2solid
Strongly made or having real substance.Also: sturdy, substantial, firm.

“Substaintiúil” after a noun

An Irish adjective comes after its noun. Here is substaintiúil after méadú (increase, masculine), after suim (interest, feminine) and after a plural.

after a masculine nounméadú substaintiúila substantial increase
after a feminine nounsuim shubstaintiúila substantial interest
after a plural nounméaduithe substaintiúlasubstantial increases

séimhiú (the h) the ending

feminine
suiminterest
+
substaintiúilsubstantial
=
suim shubstaintiúila substantial interest

After a feminine noun the adjective gets a séimhiú, an h after its first letter: suim shubstaintiúil. After a masculine noun it stays as it is: méadú substaintiúil.

plural
méaduitheincreases
+
substaintiúlasubstantial, plural
=
méaduithe substaintiúlasubstantial increases

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

More substantial, most substantial, very substantial

níosmore
+
substaintiúlasubstantial
=
níos substaintiúlamore substantial
ismost
+
substaintiúlasubstantial
=
is substaintiúlamost substantial

Tá an tuarascáil seo níos substaintiúla ná an ceann eile. This report is more substantial than the other one.

more substantialníos substaintiúlain the past tense: ní ba shubstaintiúla
most substantialis substaintiúlain the past tense: ba shubstaintiúla
as substantial aschomh substaintiúil leno change after chomh
very substantialan-substaintiúilan- lenites, except d, t and s
too substantialróshubstaintiúilró- lenites

“Substaintiúil” in a sentence: Irish examples

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

Bhí méadú substaintiúil ar an líon daoine.
There was a substantial increase in the number of people.
Fuair siad suim shubstaintiúil airgid.
They received a substantial sum of money.
Rinneadh athruithe substaintiúla ar an bplean.
Substantial changes were made to the plan.
Tá an tuarascáil seo níos substaintiúla ná an ceann eile.
This report is more substantial than the other one.
Tá an difríocht substaintiúil.
The difference is substantial.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Substantial in Irish: frequently asked questions

What is the Irish for substantial?

The Irish for substantial is substaintiúil (pronounced “SUB-stan-chool”). It comes after the noun: méadú substaintiúil, a substantial increase; suim shubstaintiúil, a substantial interest.

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

níos substaintiúla is more substantial and is substaintiúla is most substantial. In the past tense they become ní ba shubstaintiúla and ba shubstaintiúla.

Why does substaintiúil become shubstaintiúil?

After a feminine singular noun an adjective is lenited: it gets an h after its first letter. So suim shubstaintiúil (a substantial interest) but méadú substaintiúil (a substantial increase), because méadú is masculine.

What is the plural of substaintiúil?

With a plural noun substaintiúil becomes substaintiúla: méaduithe substaintiúla, suimeanna substaintiúla.

How do you say very substantial in Irish?

an-substaintiúil. Too substantial is róshubstaintiúil, and as substantial as is chomh substaintiúil le.

Does substaintiúil have more than one meaning?

Yes. Substaintiúil can mean substantial or solid, depending on context; the first is the most common.

Is there a more common word than 'substaintiúil' for 'considerable'?

Yes, 'suntasach' or simply 'mór' are often used in everyday speech, for example 'méadú suntasach'.

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