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The top 12 most satisfying Welsh language insults to aim at your worst enemy – or your mates

28 Apr 2022 7 minute read
Angry. Photo by Julien L on Unsplash

The Welsh language has been blessed with a vast arsenal of insults for every occasion, some slightly less rude but others, more so.

Note that this is not a list of general swear words, which in Welsh would run into another article entirely – these are just for when you want to insult someone, either mildly or very harshly.

Use these at your own risk, as some would be considered to be not so insulting in some parts of Wales, but extremely offensive in others.

We’ve left out insults that are commonly used in Welsh but are also very common in English – ‘twat’ and ‘bastard’ etc.

So, here are some of the top Welsh language insults to aim at your worst enemy – or just your friends when you’re annoyed with them.

No farting. Image to Pulpy (CC BY-SA 2.5).


Nothing quite rolls off the tongue like a ‘sglyfath’. It essentially means someone disgusting, be that because they look bad, smell bad or act bad. This is an all-purpose insult, sometimes used in its shortened form ‘sglyf’. ‘Slebog’ is another good option. If your friend has gone into goblin mode, or farted in your general direction, aim a ‘sglyfath!’ at them.

Photo Welsh Government

Coc oen

Perhaps the most famous of Welsh language insults, because it’s easy to remember and articulate if you’re an English speaker. In means ‘lamb’s willy’, but might best be translated as ‘knob’. It has bite but can be softened a little bit by calling someone ‘bach o coc oen’ (a little bit of a lamb’s willy). A Senedd Member was once reprimanded for calling a Plaid Cymru councillor a ‘coc oen’. There is a range of other similar options including ‘pen pidyn’, ‘pen pidlan’, ‘pen coc’, which all mean ‘knob’ or ‘dick head’.

Cont – safe to use in Caernarfon, maybe not elsewhere. Picture by Ifan Morgan Jones.

Cont uffar

How the insult ‘cont’ will land depends to a large extent where in Wales you are as it’s a term of jokey affection in Caernarfon where the greeting ‘Iawn, cont?’ is a common one. Elsewhere it my be received much as it would in English. Perhaps it’s worth adding an ‘uffar’ – ‘hellish’ – to the end just to make your intentions entirely clear.

A 17th century twmffat. Picture in the public domain.


There are many ways of calling someone an idiot in Welsh, but few are as satisfying as ‘twmffat’ – which literally means a funnel into which you pour liquid but actually means that someone is a complete eejit. Can be doubled up as ‘twmffat twp’ for some nice alliteration. ‘Twpsyn’, is another variation on ‘idiot’.

The famous Salem painting by Sydney Curnow Vosper, including the devil in the shawl.


Wales considere itself one of the most religious nations on earth up until after the first world war and that may be why there is such a strong fire and brimstone flavour to many of the insults. ‘Diawl’ means the devil, but there is also a choice of ‘cythraul’ (demon) and you can always add an ‘uffer’ or ‘uffernol’ (hellish) to the end for a bit of extra heat. ‘Diawl bach’ (little devil) is another variation.

A lembo takes flight. Photo by Dave Lowe on Unsplash


Who knows what the word ‘lembo’ derives from – the dictionary offers few clues – but you’ll certainly feel like one if you’re called it. It’s usually directed at someone who has just done something very stupid – ‘y lembo!’ ‘Pwrs’ is another good option – literally ‘purse’, and this of course means ‘ball sack’ and refers to someone – usually a man – that’s a bit of a twat. ‘Twlsyn’ is another one that convey much of the same strength of feeling. ‘Pwrs’ and ‘twlsyn’ suggest that someone is generally and perhaps deliberately unpleasant, however, while a ‘lembo’ can just be thick.

Why not have a lie in? Photo by Yogendra Singh on Unsplash


This is one of the milder insults on the list and simply means that someone is lazy, but comes from the word ‘pydru’ – to decompose. So when you’re calling someone a pwdryn you’re suggesting that unless they get their butt into gear they’re going to start decaying where they sit, which is nicely evocative. There are a few other good insults that suggest that someone is lazy like ‘torth’ (loaf), ‘rhech’ (fart) or perhaps best of all ‘rhechan mewn pot jam’ (a fart in a jam pot). ‘Bwp’ is a southwestern alternative to call someone stupid or slow to start working.

Four knaves on playing cards. Picture by Edroeh (CC BY-SA 3.0).


This is interesting as it’s an insult that has fallen out of fashion in English but continues to be use quite commonly in Welsh. It’s literally ‘knave’ and has the same connotations of being a scoundrel, rogue or rapscallion.

The sguthan – the common woodpigeon. Picture by Tristan Fern (CC BY 2.0).


This is usually translated as ‘bitch’ as it tends to be directed at someone who is a woman rather than men as in the case of ‘coc oen’, ‘pwrs’ etc, but in reality, it’s quite a bit milder than that. Other insults along the same lines include ‘hulpan’, ‘jadan’, and ‘jolpan’. A ‘sguthan’ is a actully a common wood pigeon, and fed on farmers’ grain which is perhaps how it got its bad reputation.

An ugly gargoyle. Picture by Joe Mabel (CC BY-SA 3.0).


This literally means placenta or afterbirth and as that suggests tends to be aimed at someone a little bit disgusting, be that because of how they look or how they act. ‘Sprych’ is another variation on this insult. It helps that the word has some harsh sounds in it, an ‘ych’, and is easy to spit out like a poisoned bullet. ‘Cŵd’ (scrotum) is another good option that has similar properties, and a ‘llabwst’ is usually someone who is rather ugly but also big and ungainly.

The original Dic Sion Dafydd from Jac Glan-y-gors’ ballad

Dic Sion Dafydd

This is an insult with strong political connotations as it means that someone has sold out Wales for their own financial or political gain, or just turned their back on the country. It comes from a ballad written in the 18th century by Jac Glan-y-gors, about the titular Dic Sion Dafydd who returns to Wales from England but is so pompous that he insists on speaking English even with his own Welsh-speaking mother. In modern times it is often an insult aimed at people from Wales who have climbed to the upper echelons of the British establishment and seem to have forgotten where they came from.

Cowering in fear – the cachgi. Photo by Matthew Henry on Unsplash


Literally ‘shit-dog’, i.e. a dog that soils itself in fright, this refers to someone who is a bit of a coward. Variations include ‘llwfrgi’ (coward-dog), ‘cachwr’ (shit-man). Another alternative is ‘llipryn’ (flaccid-thing) which also tends to be aimed at people who are generally weak and not always necessarily cowardly.

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1 year ago

very useful glossary for avoiding the swear-filters in the comments sections.

1 year ago
Reply to  cathayslien

And yet my admittedly unpopular post with no swear words whatsoever gets removed. Possibly for using the term Wenglish to refer to a group of people explicitly including myself.
Hmm it seems that Nation Cymru’s offence taking engine is as mysterious and as arbitrary as that in LinkedIn.

1 year ago

Never mind more ‘more Welsh’ – I’d just love to be fluent. (Dwyieithog iawn)

1 year ago

ooo. Least popular post I’ve done there. Lot of WalesOnline fans maybe? 😀

1 year ago
Reply to  Llinos

Useful for adult learners as well, Llinos.

1 year ago

I’ve never been able to spot the devil in the Vosper painting, and, believe me, I’ve tried.

1 year ago
Reply to  Rhosddu

The crease on the inside “angle” of the front lady’s left arm/elbow is the eye as far as I’m aware – you then work your way down his “face”to his “beard” – the trim of the shawl.

At least that’s what I was shown!

Last edited 1 year ago by Llewz
1 year ago
Reply to  Llewz

Diolch, Llewz.

1 year ago

Well, have I laughed over here! Fluent Welsh speaker, living away from the homeland for past 30 yrs. Haven’t heard these beauts for a long time, other than in my head. Feeling Hiraeth for those real characters of my past who’s conversations were oft peppered with the very sayings in the article. Diolch. Arbennig.

1 year ago
Reply to  Seren

Wedi mwynhâu’r sylwadau hefyd!

Dai Rob
Dai Rob
1 year ago

Defnyddiol iawn! Diolch / Very useful N.C. 🙂

Gareth Jones
Gareth Jones
11 months ago

I think most of these definitely apply to the members of the Tory party in Cymru, especially Dic Sion Dafydd, which fits Andrew RT Davies and Simon Hart like a glove

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