Brezhoneg · Kemmadurioù
Initial consonant mutation is a hallmark of Celtic linguistics. Words systematically alter their opening consonant based on what precedes them—whether possessive pronouns, prepositions, numbers, or grammatical gender.
| Radical (Base) | Mutated Form | Blocked Exceptions |
|---|---|---|
| p | b | None |
| t | d | None |
| k | g | None |
| b | v | None |
| d | z | None |
| g | c'h | None |
| gw | w | None |
| m | v | None |
| Radical (Base) | Mutated Form | Blocked Exceptions |
|---|---|---|
| p | f | None |
| t | z | None |
| k | c'h | None |
| Radical (Base) | Mutated Form | Blocked Exceptions |
|---|---|---|
| b | p | None |
| d | t | None |
| g | k | None |
| gw | kw | None |
| Radical (Base) | Mutated Form | Blocked Exceptions |
|---|---|---|
| b | v | None |
| m | v | None |
| g | c'h | None |
| gw | w | None |
| d | t | None |
The following words and grammatical contexts trigger consonant mutations in Breton:
my (1sg possessive, triggers spirant mutation)
your (2sg possessive, triggers soft mutation)
his (3sg.m possessive, triggers soft mutation)
her (3sg.f possessive, triggers spirantization on k/p/t)
our (1pl possessive, triggers spirantization on k/p/t; before vowel becomes 'hon')
their (3pl possessive, triggers spirantization on k/p/t)
your (2pl polite possessive, triggers hardening: b→p, d→t, g→k)
verbal particle (preceding conjugated verb), triggers mixed mutation: b/m/g/gw lenite, d hardens; k/p/t normally stay unchanged
if (counterfactual/hypothetical conjunction), triggers mixed mutation on the following verb
direct relative / front-position verbal particle 'a', triggers soft mutation
negative imperative particle 'na', triggers soft mutation
negative particle 'ne', triggers soft mutation on the verb (followed by 'ket' for full negation)
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