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Toxic in Irish (tocsaineach): Meaning, Forms, Examples

The Irish for toxic is tocsaineach: ceimiceán tocsaineach, a toxic chemical.
Updated October 2026Report a mistake

How to say “toxic” in Irish

Irish:
tocsaineach
English:
toxic
Word type:
adjective
More toxic:
níos tocsainí
Most toxic:
is tocsainí
Plural:
tocsaineacha
Pronunciation:
“TOK-sin-yukh”  /ˈt̪ˠɔksənʲəx/

What does “tocsaineach” mean?

toxic
Poisonous or harmful to living things, especially because it contains toxins.Also: poisonous, noxious, harmful.

Other Irish adjectives for toxic: nimhiúil (poisonous)

“Tocsaineach” after a noun

An Irish adjective comes after its noun. Here is tocsaineach after ceimiceán (chemical, masculine), after gaoth (wind, feminine) and after a plural.

after a masculine nounceimiceán tocsaineacha toxic chemical
after a feminine noungaoth thocsaineacha toxic wind
after a plural nounceimiceáin thocsaineachatoxic chemicals

séimhiú (the h) the ending

feminine
gaothwind
+
tocsaineachtoxic
=
gaoth thocsaineacha toxic wind

After a feminine noun the adjective gets a séimhiú, an h after its first letter: gaoth thocsaineach. After a masculine noun it stays as it is: ceimiceán tocsaineach.

plural
ceimiceáinchemicals
+
tocsaineachatoxic, plural
=
ceimiceáin thocsaineachatoxic chemicals

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

More toxic, most toxic, very toxic

níosmore
+
tocsainítoxic
=
níos tocsainímore toxic
ismost
+
tocsainítoxic
=
is tocsainímost toxic

Tá an gás seo níos tocsainí ná an ceann eile. This gas is more toxic than the other one.

more toxicníos tocsainíin the past tense: ní ba thocsainí
most toxicis tocsainíin the past tense: ba thocsainí
as toxic aschomh tocsaineach leno change after chomh
very toxican-tocsaineachan- lenites, except d, t and s
too toxicróthocsaineachró- lenites

“Tocsaineach” in a sentence: Irish examples

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

Doirteadh ceimiceán tocsaineach san abhainn.
A toxic chemical was spilled into the river.
Tháinig gaoth thocsaineach ón monarcha.
A toxic wind came from the factory.
Ní mór dramhaílí tocsaineacha a stóráil go sábháilte.
Toxic wastes must be stored safely.
Tá an gás seo níos tocsainí ná an ceann eile.
This gas is more toxic than the other one.
Tá an t-uisce sa loch tocsaineach anois.
The water in the lake is toxic now.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Toxic in Irish: frequently asked questions

What is the Irish for toxic?

The Irish for toxic is tocsaineach (pronounced “TOK-sin-yukh”). It comes after the noun: ceimiceán tocsaineach, a toxic chemical; gaoth thocsaineach, a toxic wind.

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

níos tocsainí is more toxic and is tocsainí is most toxic. In the past tense they become ní ba thocsainí and ba thocsainí.

Why does tocsaineach become thocsaineach?

After a feminine singular noun an adjective is lenited: it gets an h after its first letter. So gaoth thocsaineach (a toxic wind) but ceimiceán tocsaineach (a toxic chemical), because ceimiceán is masculine.

What is the plural of tocsaineach?

With a plural noun tocsaineach becomes tocsaineacha: ceimiceáin thocsaineacha, gaotha tocsaineacha. After a plural that ends in a slender consonant it is lenited as well.

How do you say very toxic in Irish?

an-tocsaineach. Too toxic is róthocsaineach, and as toxic as is chomh tocsaineach le.

What is the difference between 'tocsaineach' and 'nimhiúil'?

'Tocsaineach' is the technical word for toxic, used in science and environmental contexts, while 'nimhiúil' is the everyday word for poisonous, as in 'beacán nimhiúil' (a poisonous mushroom).

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