Rafbókin er líka laus.

Because Icelandic very often uses compound nouns where English uses two separate words.

• raf- = electric / electronic
• bók = book

So rafbók is literally electronic-book, i.e. e-book. Writing it as one word is the normal Icelandic pattern.

The ending -in is the definite article, meaning the.

In Icelandic, the is usually attached to the noun instead of standing as a separate word.

• rafbók = an e-book / e-book
• rafbókin = the e-book

Here the base noun is rafbók, and -in marks it as definite.

Rafbókin is:

• singular
• feminine
• nominative

The noun bók is feminine, and the whole compound rafbók keeps that gender. Since it is the subject of the sentence, it appears in the nominative case.

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

So it works just like is in English:

• Hún er... = She is...
• Bókin er... = The book is...

In this sentence, rafbókin er... means the e-book is...

Yes. In this sentence, líka means also.

That can confuse learners because Icelandic also has a verb líka meaning to like / to please, but that is a different use.

Here, líka is an adverb, placed after er:

• Rafbókin er líka laus. = The e-book is also available / free.

Compare that with the verb:

• Mér líkar bókin. = I like the book.
  Literally: The book pleases me.

So the meaning depends on grammar and sentence structure.

That position is very natural in Icelandic. Adverbs like líka often come after the verb.

So:

• Rafbókin er líka laus
  is a normal way to say
• The e-book is also available

You may also see other word orders in Icelandic depending on emphasis, but this version is neutral and natural.

Laus has several meanings depending on context, including:

• loose
• free
• available
• unattached
• vacant

In this sentence, it most likely means something like:

• available
• free
• obtainable without restriction, depending on context

So this is a good example of a word whose meaning is broader than a single English equivalent.

Yes, it is very close in meaning in some contexts, and learners often notice the similarity. But in Icelandic, laus is used more broadly than English loose.

For example, laus can describe something that is:

• physically loose
• free from something
• available
• not occupied

So in this sentence, you should not automatically picture something physically loose. Context is important.

Because in the nominative singular, the adjective form laus can be used with a feminine noun as well.

Predicate adjectives in Icelandic agree with the subject in gender, number, and case. Here the subject is rafbókin, which is feminine singular nominative, and laus is the correct agreeing form in that context.

A useful point to remember is that Icelandic adjective endings are not always unique for each gender in every form.

A rough guide for an English speaker is:

• Rafbókin ≈ RAHV-boh-kin
• er ≈ ehr
• líka ≈ LEE-ka
• laus ≈ something like lœys or loyss, depending on how exact you want to be

A few pronunciation tips:

• Stress usually falls on the first syllable of each word in Icelandic.
• á, í, ó, ú, ý, æ, au represent distinct vowel sounds, not just stressed versions of plain vowels.
• au in laus is not pronounced like English aw.

So the sentence has main word stresses like:

• RAFbókin
• ER
• LÍka
• LAUS

Yes, Icelandic allows more word-order flexibility than English, especially for emphasis. But Rafbókin er líka laus is the straightforward, neutral version.

Changing the order can shift emphasis. For example, moving líka can make the sentence focus more strongly on also. Still, for a learner, the given order is the safest and most natural one to use first.