Mutation

Sindarin Grammar 1

Course 1 · Chapter 4 · Mutation

Mutation is the feature that gives Sindarin its Welsh flavour, and the one that learners find hardest. It is also the part of the grammar where the evidence is thinnest and the experts disagree most. This chapter teaches what is solid, shows the attested examples, and says plainly where it stops.

The idea in a box
In Sindarin the first consonant of a word can change, depending on the word before it. The original is the radical; the changed form is a mutation. You do not choose a mutation: a trigger word demands it.

What Mutation Looks Like

The same word may begin differently on the page. Here is one word, bâr "home", with its first letter changing after different words, as one learner's chart shows it:

# one chart's forms for bâr "home" (the labels differ between sources) bâr the radical form vâr one chart's "soft" form b → v mâr one chart's "nasal" form b → m mbar one chart's "mixed" form b → mb # attested in a text: the plural article before bâr (plural bair) i mbair the homes

The point of the chart is not to memorise it but to see the pattern: the first sound moves along a short list of related sounds.

Soft Mutation: the Most Common

The most widely occurring mutation follows the singular article i, and some prepositions and prefixes. This is the table given in the source used for Tolkien's Languages 6:

# radical → soft t → d p → b c → g d → dh g → ' (the consonant is lost) # attested after the article i gwath shadow → i 'wath the shadow

Triggers listed by one source for the soft mutation include the singular article i; the prepositions ab, am, adel, be, dad, di, na, nu; and the prefixes athra-, ath-, go-, gwa-, ú-, u-. Other sources list slightly different words, so check any single trigger before relying on it.

The Article and the Plural: Nasal Mutation

The plural article in loses its final n before a consonant, and what it leaves behind is a change to the first consonant. These examples are attested:

# in + a word beginning in a consonant hên child → i chîn the children têw sign → i thiw the signs belegorn great tree → i melegyrn the great trees bâr home → i mbair the homes # before a vowel the n stays Edhil elves → in Edhil the Elves

Look at the first letters: h → ch, t → th, b → m or mb, c → ch. These do not follow one tidy table, and different scholars describe them differently.

The Other Mutations, Briefly

NameTypical triggers (as listed by one source)Status
Softsingular article i; prepositions such as ab, am, be, di, na, nuBest attested
Nasalplural article in; prepositions such as an, danAttested after in
Mixedthe genitive article en and some prepositions with in (ben, erin, nan, uin)The label itself is tentative
Stopthe prepositions ed, ned, o(d)One source only
Liquidnone agreedSeen in the example galadh → 'aladh

The sources do not agree on the number of mutations, their names or their triggers. One source even describes the "mixed" mutation as little more than lenition. Treat this table as a map of the territory, not a rulebook.

A Puzzle: i-Pheriannath

Chapter 2 noted that i-pheriannath "the halflings" is spelled with ph. If the article i triggered only the soft mutation, p would become b, not ph. The attested form shows ph. It is a reminder that Tolkien's own text does not always match the neat tables.

Watch out: do not trust a single mutation chart
Charts from different websites give different outputs for the same letter. Use the attested examples (i 'wath, i chîn, i thiw, i melegyrn, i mbair) as your anchor and treat the rest as scholars' proposals.
Watch out: mutation can hide a word
A mutated word looks different in the dictionary. When you cannot find a word, undo the mutation: chîn is a mutated hên, and 'wath is a mutated gwath.
Common myths
  • "Sindarin has one settled mutation table." It has several proposals.
  • "Mutation is optional." In the attested texts it is regular after the article.
  • "Mutation is the same as Welsh." Tolkien took the idea from Welsh, but Sindarin's pattern is its own.

Hands-On Exercises

Exercise 1

Using the soft table, say what t, p, c, d and g become, then explain how gwath becomes i 'wath. Label the mutation soft, nasal or other.

📄 View solution
Exercise 2

For each attested plural, undo the mutation and name the radical: i chîn, i thiw, i melegyrn, i mbair. State the first-letter change in each.

📄 View solution
Exercise 3

Explain why i-pheriannath is a puzzle for the soft table, and why a learner should be cautious about any single mutation chart.

📄 View solution

Chapter 4 Quick Reference

  • Mutation = the first consonant changes after a trigger word
  • Soft (after singular i): t → d, p → b, c → g, d → dh, g → ' (gwath → i 'wath)
  • After plural in: i chîn, i thiw, i melegyrn, i mbair; in Edhil before a vowel
  • Other types: mixed, stop, liquid: triggers disputed
  • Anchor on attested examples; undo the mutation to find a word
Coming next
Sindarin Grammar 1, Chapter 5 turns to adjectives: how they agree with the noun, where they stand, and how they are compared.