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Necessary in Irish (riachtanach): Meaning, Forms, Examples

The Irish for necessary is riachtanach: fear riachtanach, a necessary man.
Updated October 2026Report a mistake

How to say “necessary” in Irish

Irish:
riachtanach
English:
necessary
Word type:
adjective
More necessary:
níos riachtanaí
Most necessary:
is riachtanaí
Plural:
riachtanacha
Pronunciation:
“REE-akh-tan-akh”  /ˈɾʲiəxt̪ˠənˠəx/

What does “riachtanach” mean?

necessary
Needed or required; something you must have or do.Also: essential, needed, required, indispensable, requisite.

“Riachtanach” after a noun

An Irish adjective comes after its noun. Here is riachtanach after fear (man, masculine), after cuid (part, feminine) and after a plural.

after a masculine nounfear riachtanacha necessary man
after a feminine nouncuid riachtanacha necessary part
after a plural nounfir riachtanachanecessary men

séimhiú (the h) the ending

plural
firmen
+
riachtanachanecessary, plural
=
fir riachtanachanecessary men

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

More necessary, most necessary, very necessary

níosmore
+
riachtanaínecessary
=
níos riachtanaímore necessary
ismost
+
riachtanaínecessary
=
is riachtanaímost necessary

Tá uisce níos riachtanaí ná rud ar bith eile. Water is more necessary than anything else.

more necessaryníos riachtanaíin the past tense: ní ba riachtanaí
most necessaryis riachtanaíin the past tense: ba riachtanaí
as necessary aschomh riachtanach leno change after chomh
very necessaryan-riachtanachan- lenites, except d, t and s
too necessaryróriachtanachró- lenites

“Riachtanach” in a sentence: Irish examples

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

Is eolas riachtanach é sin do gach mac léinn.
That is essential information for every student.
Is cuid riachtanach den chúrsa í an obair bhaile.
Homework is an essential part of the course.
Cheannaigh sí na rudaí riachtanacha sa siopa.
She bought the necessary things in the shop.
Tá uisce níos riachtanaí ná rud ar bith eile.
Water is more necessary than anything else.
Tá sé riachtanach cead a fháil ar dtús.
It is necessary to get permission first.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Necessary in Irish: frequently asked questions

What is the Irish for necessary?

The Irish for necessary is riachtanach (pronounced “REE-akh-tan-akh”). It comes after the noun: fear riachtanach, a necessary man; cuid riachtanach, a necessary part.

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

níos riachtanaí is more necessary and is riachtanaí is most necessary. In the past tense they become ní ba riachtanaí and ba riachtanaí.

What is the plural of riachtanach?

With a plural noun riachtanach becomes riachtanacha: fir riachtanacha, codanna riachtanacha.

How do you say very necessary in Irish?

an-riachtanach. Too necessary is róriachtanach, and as necessary as is chomh riachtanach le.

Which preposition follows riachtanach?

Use 'do' for the person or purpose: 'Tá sé riachtanach duit' means 'It is necessary for you'.

How do I say 'unnecessary'?

Use 'neamhriachtanach', as in 'costas neamhriachtanach', an unnecessary expense.

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