Magistra dicit studium sine disciplina minus utile esse.

The main finite verb is dicit = says.

Everything after it — studium sine disciplina minus utile esse — is the content of what the teacher says. In Latin, that content is often expressed as an indirect statement.

So the sentence divides like this:

• Magistra = the subject of the whole sentence
• dicit = the main verb
• studium sine disciplina minus utile esse = what she says

Because Latin is using an indirect statement after dicit.

After verbs like:

• dicit = says
• putat = thinks
• scit = knows
• audit = hears

Latin often does not use a finite verb like est. Instead, it uses an infinitive, here esse.

So:

• utile est = it is useful
• dicit ... utile esse = she says ... to be useful, or more naturally, she says that ... is useful

That is why esse appears.

Latin usually does not need a separate word for that in this kind of sentence.

In English we say:

• The teacher says that study is less useful...

In Latin, the idea of that is built into the accusative + infinitive construction:

• dicit studium ... esse

So there is no missing word. The grammar itself expresses that.

It actually is accusative here, but its form looks the same as the nominative.

In an indirect statement, the subject of the infinitive is normally put in the accusative case. So studium is the subject of esse, and therefore accusative.

But studium is a neuter second-declension noun, and in neuter nouns:

• nominative singular = accusative singular

So:

• nominative: studium
• accusative: studium

They look identical. You have to tell the case from the sentence structure, not from the ending alone.

Because utile agrees with studium, which is neuter singular.

The adjective utilis, utile has these nominative singular forms:

• masculine/feminine: utilis
• neuter: utile

Since studium is neuter, the adjective must also be neuter:

• studium utile = useful study

In this sentence, because of the indirect statement, utile is technically agreeing with an accusative neuter singular noun, but for neuter singular this form is still utile.

So utile is exactly what we expect.

Because it follows the preposition sine, and sine takes the ablative.

So:

• sine disciplina = without discipline

This is just a rule of the preposition:

• sine + ablative

A learner should get used to memorizing prepositions together with the case they require.

It means less useful.

Here minus is an adverb meaning less, and it modifies the adjective utile.

So:

• utile = useful
• minus utile = less useful

This does not mean not useful at all. It is comparative: useful, but to a lesser degree.

Latin often forms less + adjective with minus + positive adjective, just as here.

Latin does have comparative adjective forms, but less X is commonly expressed with minus + adjective.

So for less useful, Latin naturally says:

• minus utile

rather than trying to build a special one-word form meaning less useful.

This is very normal Latin usage.

Latin word order is more flexible than English word order, because the endings show the grammatical relationships.

This sentence has a very natural arrangement:

• Magistra = subject first
• dicit = main verb early
• then the indirect statement
• esse at the end, which is very common in Latin

So the order is natural and clear, but Latin could rearrange parts of the indirect statement for emphasis, for example:

• Magistra studium sine disciplina minus utile esse dicit

That would still mean the same basic thing.

Classical Latin has no articles like English the and a/an.

So:

• magistra can mean the teacher or a teacher
• studium can mean study or the study, depending on context
• disciplina can mean discipline or the discipline

English has to choose an article when translating, but Latin usually leaves that to context.

There are two clues:

1. Magistra is in the nominative, which is the normal case for the subject of the main verb.
2. dicit is a main finite verb, and studium belongs to the indirect statement after it.

So:

• Magistra dicit = The teacher says
• studium ... esse = that study ... is

Even though studium looks nominative in form, in this sentence it functions as the accusative subject of esse, not as the subject of dicit.