Ættleiðingarsamningurinn er tilbúinn.

It is a compound noun:

• ættleiðing = adoption
• samningur = contract, agreement
• -inn / -urinn = the definite article the attached to the noun

So ættleiðingarsamningurinn literally means the adoption agreement/contract.

A very common feature of Icelandic is that long words are often built by combining smaller words like this.

In Icelandic, the is usually added to the end of the noun instead of appearing as a separate word before it.

So:

• samningur = a contract
• samningurinn = the contract

In this sentence, that same pattern appears inside the longer compound:

• ættleiðingarsamningur = an adoption agreement
• ættleiðingarsamningurinn = the adoption agreement

This is one of the first big differences English speakers notice.

The basic noun is samningur, which is a masculine noun.

Many masculine nouns that end in -ur form the definite nominative singular with -inn, but because of the noun’s shape, the result appears as -urinn:

• samningur → samningurinn

So the ending is not random; it reflects:

• masculine gender
• singular number
• nominative case
• definite form

It is in the nominative singular.

That is because it is the subject of the sentence:

• Ættleiðingarsamningurinn = the subject
• er = is
• tilbúinn = ready

In simple X is Y sentences, the subject is normally nominative.

The adjective has to agree with the noun it describes.

Here, ættleiðingarsamningurinn is:

• masculine
• singular
• nominative

So the adjective also appears in the masculine singular nominative form:

• tilbúinn

Compare:

• samningurinn er tilbúinn = the agreement is ready
• bókin er tilbúin = the book is ready
• húsið er tilbúið = the house is ready

So the ending changes depending on the gender and number of the noun.

Er is the present tense of vera, the verb to be.

So:

• ég er = I am
• þú ert = you are
• hann/hún/það er = he/she/it is

In this sentence, er simply means is.

This sentence has very straightforward word order:

• Ættleiðingarsamningurinn = subject
• er = verb
• tilbúinn = complement/adjective

So it follows the simple pattern:

Subject + verb + adjective

That is very similar to English:

The adoption agreement is ready.

Icelandic often has verb-second word order in many sentence types, but this particular sentence is as simple and direct as it looks.

That -ar- is a linking form that appears when the noun ættleiðing is used as the first part of a compound.

So:

• ættleiðing
• • samningur
• → ættleiðingarsamningur

This kind of connector is very common in Icelandic compounds. English also has compounds, but Icelandic tends to build them more systematically and write them as one word.

A rough learner-friendly guide is:

EYE-tlэй-thing-ar-sam-ning-ur-rin

A few important pronunciation notes:

• æ sounds roughly like eye
• ð is like the th in this (though in some positions it can be weaker)
• ll in Icelandic does not always sound like English ll, so this part may take practice
• stress is usually on the first syllable in Icelandic words

And tilbúinn is roughly:

til-BOO-inn

The second syllable is stressed more clearly there.

Yes, and that is a very good habit in Icelandic.

Try it like this:

• ættleiðingar-samningur-inn
• er
• tilbúinn

Then identify the roles:

• noun: samningur = agreement/contract
• first compound element: ættleiðingar- = adoption
• definite ending: -inn = the
• verb: er = is
• adjective: tilbúinn = ready

This is often the best way to approach long Icelandic words: find the base noun, then identify the added pieces.

Yes. Samningur can often be translated as agreement or contract, depending on context.

So without more context, either of these may work:

• The adoption agreement is ready.
• The adoption contract is ready.

English sometimes forces you to choose a more specific word than Icelandic does.

You would remove the definite article from the noun.

So:

• ættleiðingarsamningurinn = the adoption agreement
• ættleiðingarsamningur = an adoption agreement

The sentence would be:

Ættleiðingarsamningur er tilbúinn.

The adjective tilbúinn would stay the same here, because the noun is still masculine singular nominative. Only definiteness changes.

Yes, tilbúinn is a very natural word for ready.

So samningurinn er tilbúinn means the agreement is prepared, completed, or ready for the next step, depending on context.

In real use, the exact nuance could be:

• the document has been drafted
• it is ready to sign
• it is ready to use
• it is finished and available

Context tells you which sense is intended.