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Bad in Irish (olc): Meaning, Forms, Examples

Other uses of ‘olc’: evil · angry · wickedness (noun, masculine)

The Irish for bad is olc: lá olc, a bad day.
Updated October 2026Report a mistake

How to say “bad” in Irish

Irish:
olc
English:
bad, evil, angry
Word type:
adjective
Worse:
níos measa
Worst:
is measa
Plural:
olca
Pronunciation:
“ulk”  /ɔl̪ˠk/

What does “olc” mean?

“Olc” has three alternative meanings. The most common comes first.

bad
Of poor quality or unpleasant; not good.Also: poor, terrible, awful.
2 other meanings: evil or angry
2evil
Morally wrong or wicked.Also: wicked, wrong.
3angry
Annoyed or in a bad temper, usually used with 'bheith olc'.Also: cross, annoyed.

Other Irish adjectives for bad: dona (bad)

Other entries for “olc”

The same spelling has its own page as:

“Olc” after a noun

An Irish adjective comes after its noun. Here is olc after lá (day, masculine), after aimsir (weather, feminine) and after a plural.

after a masculine nounlá olca bad day
after a feminine nounaimsir olcbad weather
after a plural nounlaethanta olcabad days

séimhiú (the h) the ending

plural
laethantadays
+
olcabad, plural
=
laethanta olcabad days

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

Worse, worst, very bad

níosmore
+
measabad
=
níos measaworse
ismost
+
measabad
=
is measaworst

Tá an aimsir níos measa inniu ná inné. The weather is worse today than yesterday.

worseníos measain the past tense: ní ba mheasa
worstis measain the past tense: ba mheasa
as bad aschomh holc lechomh puts an h before a vowel
very badan-olcan- lenites, except d, t and s
too badró-olcró- lenites

“Olc” in a sentence: Irish examples

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

Bhí lá olc againn inné.
We had a bad day yesterday.
Bhí an aimsir go holc ar feadh na seachtaine.
The weather was bad all week.
Tá an aimsir níos measa inniu ná inné.
The weather is worse today than yesterday.
Níl sé ró-olc.
It's not too bad.

Other adjectives in Irish

More everyday Irish adjectives to learn next.

Bad in Irish: frequently asked questions

What is the Irish for bad?

The Irish for bad is olc (pronounced “ulk”). It comes after the noun: lá olc, a bad day; aimsir olc, bad weather.

How do you say worse and worst in Irish?

níos measa is worse and is measa is worst. In the past tense they become ní ba mheasa and ba mheasa.

What is the plural of olc?

With a plural noun olc becomes olca: laethanta olca, aimsirí olca.

How do you say very bad in Irish?

an-olc. Too bad is ró-olc, and as bad as is chomh holc le.

Does olc have more than one meaning?

Yes. Olc can mean bad, evil or angry, depending on context; the first is the most common.

What is the difference between 'olc' and 'droch-'?

'Droch-' is a prefix placed before the noun, as in 'drochlá', while 'olc' follows the noun or is used as a predicate, as in 'Is olc an lá é'.

Why is the comparative of 'olc' 'measa'?

'Olc' is irregular: 'níos measa' means 'worse' and 'is measa' means 'worst', just as English 'bad' becomes 'worse'.

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