Finnish IRL
mun - a woman lifting her coat off the back of a café chair as an older man reaches for the same one, melting snow outside

mun

/mun/

My. Mine. Written minun Say the phrase your textbook drilled and a Finn hears you arguing over whose book it is

minun on paper, mun out loud

Kirjakieli · written minun
Puhekieli · spoken mun

One of the written-and-spoken pairs - every word on this site that exists in both forms is in that table, beside the change between them.

The same sentence, both ways
What you will hear What the book writes
Mun mielestä se oli hyvä. Minun mielestäni se oli hyvä.
Toi on mun. Tuo on minun.
Missä mun avaimet on? Missä minun avaimeni ovat?

Quick answer

Mun means my, or mine. It is the spoken genitive of minä, written minun, and it sits in front of the thing owned.

  • Say the phrase your textbook drilled and a Finn hears you arguing. Minun kirjani is not the polite version of mun kirja - it is the contrastive one.
  • Finnish can mark ownership twice, once on the pronoun and once on the noun. Written Finnish leans on the ending, speech leans on the word, and nobody neutral uses both.
  • There are six of them: mun, sun, sen, meiän, teiän, niiden.

What mun means

Put mun in front of the thing owned and the phrase is finished: mun kirja, mun avaimet, mun vuoro.

The complication is that Finnish has a second way of saying the same thing. A possessive suffix goes on the noun itself, so kirjani already means my book with no pronoun anywhere in sight. Finnish has both, and normally uses one at a time.

Why minun became mun

The two registers did not simply shorten the same phrase. They deleted opposite halves of it.

Written Finnish trusts the ending and throws away the pronoun. The Institute for the Languages of Finland gives the rule in one line: in the first and second person the suffix on its own is enough. Tarkastaja avasi laukkuni means the inspector opened my suitcase, and no word for my appears in it.

Speech did the reverse. It kept the pronoun, shortened it to mun, and dropped the ending. Mun laukku.

So the full textbook phrase minun laukkuni is not the neutral middle point between them. It is the marked, emphatic version, and the official guidance says so outright: the genitive pronoun in front of a suffix expresses contrast or carries stress. Their own example is Tämä on minun tablettini, ei sinun. This is my tablet, not yours.

So the sentence your course drilled has a tone it never mentioned. Say minun kirjani in an ordinary conversation and a Finn does not hear formality, they hear someone settling a dispute about whose book it is.

The rule behind mun

The change in mun is not a one-off. It is one of the regular changes between written and spoken Finnish, and it applies well beyond this word.

Written Spoken What changed
Writtenminun Spokenmun What changedThe first syllable goes and the pronoun becomes unstressed.
Writtensinun Spokensun What changedSame change, second person.
Writtenhänen Spokensen What changedNot a contraction at all. Speech swaps in a different word, the demonstrative.
Writtenmeidän Spokenmeiän What changedThe d drops out between vowels, as it does across spoken Finnish.
Writtenminun kirjani Spokenmun kirja What changedThe pronoun shortens and the possessive suffix on the noun disappears with it.

How Finns actually use mun

Constantly, and almost always unstressed. Mun mielestä, in my opinion, is one of the phrases you will hear most often in a day of Finnish. Its written twin collapses into a single word, mielestäni.

The stress does the work here. Mun kirja said flatly is just my book. MUN kirja, with weight on the pronoun, is a claim.

The family is regular and small: mun, sun, sen, meiän, teiän, niiden. Learn the six and you have the spoken possessives.

Third person behaves differently and keeps its suffix better. You will hear both sen auto and hänen autonsa, and the second one is not odd the way minun kirjani is.

mun in a sentence

  • Mun mielestä se oli hyvä. I thought it was good. · written: Minun mielestäni se oli hyvä.
  • Toi on mun. That one's mine. · written: Tuo on minun.
  • Missä mun avaimet on? Where are my keys? · written: Missä minun avaimeni ovat?
mun - an older man picking his own bicycle out of a crowded rack outside a Finnish shop on a bright summer day
Minun in the textbook, mun everywhere else.

mun in a conversation

Kenen toi on?
Mun.
Se on ollu tossa kaks viikkoo.
Nii on. Se on silti MUN.

The mistake everyone makes with mun

Producing minun kirjani in conversation because it was on the vocabulary list. It is correct Finnish, and it sounds either read-aloud or argumentative.

Mixing the two systems at half strength. Mun kirjani takes the spoken pronoun and the written ending and belongs to neither register.

Assuming the ending is optional in writing too. It is not, and dropping it makes an email look sloppy.

Questions people ask about mun

What does mun mean in Finnish?

My. It is the spoken form of minun and goes in front of the thing owned: mun kirja, my book.

Why is it mun kirja and not minun kirjani?

Because speech marks ownership with the pronoun and writing marks it with the ending on the noun. Each register uses one of the two, and minun kirjani stacks both, which reads as emphasis.

Does minun kirjani sound wrong then?

Not wrong, but marked. Official Finnish language guidance describes the pronoun in front of the suffix as contrastive or stressed, so in casual talk it can sound like you are insisting the book is yours.

Is mun informal?

It is spoken, and spoken is not the same as informal. Finns say it to bosses, doctors and strangers. The written form is minun.

What is the difference between mun and mulla?

Mun is my, ownership of a thing. Mulla is I have, from minulla, and it is how Finnish expresses having anything at all.

What are the other spoken possessives?

Sun for sinun, sen for hänen, meiän for meidän, teiän for teidän, niiden for heidän.

Is mun correct Finnish?

Yes. Mun is the spoken form; minun is the written one. Both are standard Finnish - they belong to different registers, and neither is a degraded version of the other.

Is mun a bad word?

Safe with everyone in speech. Write minun.

mä - two people talking on the shore of an autumn lake beside a wooden jetty
mä written minä The word every textbook spells with three more letters
sä - an older woman behind a Finnish kiosk counter leaning forward and asking a young customer something directly, pointing with an open hand
sä written sinä The polite version you are looking for does not exist
mulla on - a woman holding up a loyalty card to show a Finnish shop cashier that she has one, bright spring daylight through the doors
mulla on written minulla on I'm hungry in Finnish is at me is a hunger, because the language never built a verb for have
oon - a young woman on the phone in an office kitchen doorway saying where she is, coffee cup already in hand, melting snow on the ledge outside
oon written olen Someone rings to say where they are. This is the word you will miss
ei oo - a shop assistant and a customer both shrugging in front of a half-empty shelf in a Finnish supermarket
ei oo written ei ole The sentence a shop assistant says to you, in the shape they say it
onks - a man leaning on a Finnish kiosk counter asking whether something is in, the older vendor already reaching under the counter
onks written onko Move the question letter one word to the left and you have asked something else
meen - a woman pulling her coat on in a dim Finnish hallway, half out of the door and calling back into the flat, snow outside
meen written menen In Finnish you do not get married - you go into marriages, and it is plural
mennään - two friends standing up from a café table at the same moment, one already pulling a coat on, melting snow outside the window
mennään written menemme "Let's go" and "we go" are the same word, and your textbook taught neither

Sources for mun

  1. Omistusliitteet - possessive suffixes Kielitoimiston ohjepankki, Kotimaisten kielten keskus - The official rule that the suffix alone suffices in the first and second person, and that adding minun or sinun expresses contrast or stress. The tablet example is theirs.
  2. VISK § 716 - minä, sinä, hän, me, te, he Iso suomen kielioppi, Kotimaisten kielten keskus - The pronoun paradigm and the spoken short forms this genitive belongs to.
  3. VISK § 1298 - contexts without a possessive suffix Iso suomen kielioppi, Kotimaisten kielten keskus - Where Finnish leaves the possessive suffix off, which is what mun kirja is doing.
  4. VISK § 95 - what possessive suffixes are Iso suomen kielioppi, Kotimaisten kielten keskus - The suffix system itself, and the forms kirjani, kirjasi, kirjansa.
  5. VISK § 144 - osaatsä, emmä, kuulittekste Iso suomen kielioppi, Kotimaisten kielten keskus - Why these short pronouns are unstressed and behave as clitics.
  6. Kielitoimiston sanakirja: minä Kotimaisten kielten keskus

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