---
name: cymraeg-language
description: Use when asked to write, translate into, or check text in Cymraeg (Welsh) — a Celtic language with initial consonant mutations, digraphs treated as single alphabet letters, and grammatical gender — spoken mainly in Wales with official status alongside English.
---

# Cymraeg Language

Cymraeg (Welsh) is a Celtic language spoken mainly in Wales, where it has
official status alongside English. It has a substantial base of first-
and second-language speakers, a long literary tradition, and is used in
government, education, media, and everyday life across Wales, with
strongholds in the north and west.

## Writing system

Welsh uses the Latin alphabet but treats several digraphs as single
letters for alphabetization and dictionary ordering: `ch`, `dd`, `ff`,
`ll`, `ng`, `ph`, `rh`, `th`. This matters for sorting word lists,
building glossaries, or generating an index — "chwech" sorts after all
plain "c" words, not interleaved with them. The letters `j`, `k`, `q`,
`v`, `x`, `z` do not occur in native Welsh vocabulary (though `j`
appears in some loanwords and place names). The circumflex (`ˆ`, "to
bach") marks a long vowel where length would otherwise be ambiguous,
e.g. `tân` (fire) vs. `tan` (until).

## Initial consonant mutations

Welsh mutates the first letter of a word depending on grammatical
context — a feature with no English equivalent. There are three
mutation types:

- **Soft mutation (treiglad meddal)** — the most common, triggered
  after many prepositions, feminine singular nouns after "the" (y/yr),
  and in various other constructions. Example: `cath` (cat) becomes
  `gath` after "y" for a feminine noun (y gath).
- **Nasal mutation (treiglad trwynol)** — triggered after words like
  "fy" (my). Example: `car` (car) becomes `nghar` (fy nghar, my car).
- **Aspirate mutation (treiglad llaes)** — triggered after words like
  "a" (and), "ei" (her), and "tri"/"chwe" before certain nouns. Example:
  `car` becomes `char` (ei char, her car).

Getting mutations wrong is one of the most common and noticeable errors
in learner or machine-generated Welsh; a mutated word must still be
recognized (and looked up) under its unmutated root form.

## Grammatical gender

Welsh nouns are masculine or feminine (no neuter). Gender affects soft
mutation (a feminine singular noun mutates after "y"/"yr", "the", where
a masculine one doesn't) and affects which form of "the" and some
adjective placements apply. Gender is not always predictable from
meaning and generally must be learned per noun, similar in spirit to
gender in German or French but interacting with mutation in a way those
languages' genders don't.

## Regional variation

The two main dialect groupings are Gogledd (North Wales) and De (South
Wales), differing in some vocabulary, idiom, and pronunciation (for
example, "nawr" vs. "rŵan" for "now"). Standard written Welsh
(Cymraeg Safonol) used in formal, educational, and official text is
largely shared across both regions, so default to the standard form
unless the audience or setting calls for a specific regional variety.

## Formality/register

Welsh distinguishes formal and informal registers in vocabulary and in
some verb forms, roughly comparable to a tu/vous-style distinction,
though less rigidly grammaticalized than in French or German. Formal
written Welsh (used in official documents, news, and literature) favors
fuller verb forms and avoids colloquial contractions common in spoken
and informal written Welsh (e.g. text messages, social media).

## Common pitfalls

- Applying no mutation at all, defaulting to the dictionary root form
  everywhere — this is the most common failure mode and produces text
  that reads as clearly non-native.
- Alphabetizing or searching word lists by individual letters instead of
  by the digraphs (`ch`, `dd`, `ff`, `ll`, `ng`, `ph`, `rh`, `th`),
  producing incorrect sort order or missed dictionary matches.
- Guessing a noun's gender from its meaning (e.g. assuming inherently
  masculine or feminine concepts map to grammatical gender) rather than
  checking the actual lexical gender, which affects mutation.
- Mixing North and South Wales vocabulary inconsistently within one
  document instead of picking one register/region and staying consistent.
- Dropping the circumflex on long vowels where it changes meaning
  (`tân` fire vs. `tan` until), or treating diacritics as optional
  decoration rather than meaningful.

## Learn more

- [[medical-language-speaking-assessment-for-cymraeg]] for a clinical Welsh-language speaking assessment, a narrower, domain-specific skill distinct from general Welsh writing.
- [[gaeilge-language]] and [[gaidhlig-language]] for related Celtic languages with their own distinct mutation systems and orthography.
- [[cross-cultural-communication]] for broader considerations when communicating with Welsh-speaking audiences beyond word choice.