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Caffeine in Irish (Caiféin): Meaning, Pronunciation, Usage

The Irish for caffeine is caiféin, a feminine noun.
Updated October 2026Report a mistake

How to say “caffeine” in Irish

Irish:
caiféin
English:
caffeine
Word type:
noun
Gender:
feminine, second declension
Pronunciation:
“KAF-ay-in”  /ˈkafʲeːnʲ/
Various forms
Genitive singular:
caiféine, na caiféine (e.g. leibhéal caiféine, level of caffeine)

What does “caiféin” mean?

caffeine
A natural stimulant found in coffee, tea and some soft drinks that makes you feel more awake.Also: stimulant, coffee stimulant.

“Caiféin” with the article

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

an chaiféin
the caffeine
Lenition: c becomes ch after an (feminine noun)

“Caiféin” in a sentence: Irish examples

Common Irish sentences using caiféin, the Irish word for caffeine.

Tá a lán caiféine sa chaife seo.
There's a lot of caffeine in this coffee.
Ní ólaim ach caife gan chaiféin anois.
I only drink decaffeinated coffee now.
Coinníonn an chaiféin i mo dhúiseacht mé san oíche.
Caffeine keeps me awake at night.
Tá caiféin i dtae freisin.
There's caffeine in tea too.
Ba chóir duit níos lú caiféine a ól.
You should drink less caffeine.
Bíonn tinneas cinn orm gan mo chaiféin ar maidin.
I get a headache without my caffeine in the morning.
Tá an iomarca caiféine sna deochanna fuinnimh sin.
There's too much caffeine in those energy drinks.

Other nouns in Irish

More everyday Irish nouns to learn next.

Caffeine in Irish: frequently asked questions

What is the Irish for caffeine?

The Irish for caffeine is caiféin (pronounced “KAF-ay-in”). It’s a feminine noun.

How do you pronounce caiféin in Irish?

Caiféin is said like “KAF-ay-in” (IPA /ˈkafʲeːnʲ/).

Does caiféin have a plural?

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

Why does caiféin change to chaiféin or gcaiféin?

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

How do I say decaffeinated coffee in Irish?

You can say 'caife gan chaiféin', literally coffee without caffeine.

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