Usmeni mi je bio lakši od pismenog.

Yes. In this sentence, usmeni and pismeni are adjectives being used as nouns.

They are short for:

• usmeni ispit = oral exam
• pismeni ispit = written exam

Croatian does this very naturally. If the noun is obvious from context, it is often left out.

So:

• Usmeni mi je bio lakši od pismenog. literally means something like:
• The oral one was easier for me than the written one.

The hidden noun is usually ispit.

Because it comes after od, and in this kind of comparison od requires the genitive case.

So:

• pismeni = nominative
• pismenog = genitive masculine/neuter singular

The full underlying phrase is:

• od pismenog ispita = than the written exam

Since ispita is omitted, the adjective stays in the form it would have if the noun were still there:

• od pismenog (ispita)

That is why you see pismenog, not pismeni.

Because usmeni is the subject of the sentence, so it is in the nominative case.

Compare the roles:

• Usmeni = the thing being talked about → nominative
• od pismenog = the thing it is compared to → genitive after od

So the structure is:

• Usmeni = subject
• mi = to me / for me
• je bio lakši = was easier
• od pismenog = than the written one

Mi is the unstressed dative form of ja. Here it means:

• to me
• for me

So Usmeni mi je bio lakši... means:

• The oral exam was easier for me...

This does not mean possession here. It is a dative of personal reference: it shows whose experience or judgment this is.

You could also say:

• Meni je usmeni bio lakši od pismenog.

That is a fuller, more emphatic version. Meni is stressed; mi is the clitic version.

Together they form the past tense.

Croatian commonly uses the perfect:

• auxiliary biti in the present: je
• plus the past participle: bio

So:

• je bio = was

This is normal Croatian grammar, not a repetition.

The same pattern appears in many verbs:

• je radio = he was working / he worked
• je došao = he came / has come
• je bio = he was

Because lakši has to agree with the noun understood here: usmeni ispit.

Since ispit is:

• masculine
• singular

the comparative adjective must also be:

• masculine
• singular

So:

• lakši = masculine singular
• lakša = feminine singular
• lakše = neuter singular / adverbial form in some contexts

Because the hidden noun is ispit, lakši is the correct form.

The pattern is:

• comparative adjective + od + genitive

Here:

• lakši = easier
• od pismenog = than the written one

So:

• lakši od pismenog = easier than the written one

This is a very common Croatian comparison pattern:

• veći od mene = bigger than me
• stariji od brata = older than my brother
• bolji od prošlog = better than the previous one

Sometimes yes, but od is the most straightforward choice here.

With noun comparisons, Croatian very often uses:

• lakši od pismenog

You may also hear nego in other comparison structures, especially when a whole clause follows, for example:

• Lakši je nego što sam očekivao. = It was easier than I expected.

For this sentence, od + genitive is the standard and very natural pattern.

Yes, Croatian word order is flexible, but mi and je are clitics, so they tend to appear near the beginning of the sentence, usually in second position.

That is why:

• Usmeni mi je bio lakši od pismenog.

sounds natural.

Other possible versions include:

• Usmeni je bio lakši od pismenog.
• Meni je usmeni bio lakši od pismenog.
• Usmeni je meni bio lakši od pismenog.

These differ slightly in emphasis, but the meaning stays basically the same.

What you normally would not do is place the clitics in an unnatural order such as:

• Usmeni je mi bio... ❌

The clitic order here is correctly:

• mi je

In most contexts, yes, that is the most likely interpretation.

Both usmeni and pismeni are very commonly used as short forms for:

• usmeni ispit = oral exam
• pismeni ispit or pismena provjera = written exam/test

If the surrounding context is school, university, or testing, speakers often omit the noun because everyone knows what is meant.

So this sentence is perfectly natural even without ispit.

Not exactly. It would shift the time reference.

• Usmeni mi je bio lakši od pismenog. = the oral exam was easier than the written one
• Usmeni mi je lakši od pismenog. = the oral exam is easier than the written one

The version with bio refers to a past situation, probably a specific exam that already happened.

The version without bio sounds present or more general, as if you are saying oral exams are easier for you in general, or this exam is easier if it is still current.

Lakši is pronounced roughly like LAHK-shee.

It comes from the adjective:

• lak = easy, light

Its comparative is:

• lakši = easier

The kš cluster is normal in Croatian and comes from the way the comparative is formed. You do not pronounce it as two separate words; it is one smooth consonant cluster.

So:

• lak → lakši

This is just something learners get used to hearing and saying.

Good question. The adjective pismen can indeed mean literate, depending on context.

But in school and exam contexts:

• pismeni very often means written test/exam
• usmeni very often means oral test/exam

So context matters a lot.

Examples:

• On je pismen. = He is literate.
• Imamo pismeni sutra. = We have a written test tomorrow.

In your sentence, because it is paired with usmeni, the exam meaning is the natural one.

Here is a compact breakdown:

• Usmeni
  nominative masculine singular; adjective used as a noun
  = the oral exam / the oral one

• mi
  unstressed dative pronoun
  = to me / for me

• je bio
  perfect tense of biti
  = was

• lakši
  comparative of lak
  = easier

• od pismenog
  od

  • genitive
    = than the written exam / than the written one

So the sentence literally works like:

• The oral one was easier for me than the written one.