La veron konfesinta knabino ne plu hontas.

The sentence has two main parts:

• La veron konfesinta knabino = the subject
• ne plu hontas = the predicate

So the whole subject is not just knabino. The participial phrase veron konfesinta is attached to knabino and tells you which girl we mean.

Konfesinta is a participle used like an adjective.

It comes from:

• konfesi = to confess
• -int- = active past participle
• -a = adjective ending

So konfesinta means something like having confessed or who confessed.

Because it is adjective-like, it modifies knabino.

It ends in -a because it is functioning as an adjective that describes knabino.

In Esperanto, participles can behave like adjectives, nouns, or adverbs:

• konfesinta = adjectival
• konfesinto = a confessor / one who confessed
• konfesinte = having confessed

Here we need the adjectival form because it describes the girl.

-int- shows that the action of confessing happened before the main time being talked about.

So:

• konfesanta = confessing, in the process of confessing
• konfesinta = having confessed, already confessed
• konfesonta = about to confess

In this sentence, the girl is now no longer ashamed, and the confessing happened earlier. That is why -int- is used.

Because the girl is the one who did the confessing.

• konfesinta = having confessed, the doer of the action
• konfesita = confessed, something that was confessed

So:

• la veron konfesinta knabino = the girl who confessed the truth
• la konfesita vero = the confessed truth

This is the difference between active and passive participles.

Because veron is the direct object of konfesi.

Even though konfesi appears here inside a participial phrase, it still keeps its object:

• konfesi la veron = to confess the truth
• la veron konfesinta knabino = the girl who confessed the truth

So the -n on veron is there for the same reason it would be in a normal clause.

Because knabino is the subject of hontas, not a direct object.

The girl is the one who is no longer ashamed. So:

• knabino = subject
• veron = object, but only inside the participial phrase

This is a good example of how an accusative object can appear inside a modifier, while the main noun itself remains the subject.

Because the participial phrase includes both the participle and its object.

Esperanto allows this kind of compact structure:

• la veron konfesinta knabino

This is roughly equivalent to:

• la knabino, kiu konfesis la veron

English usually prefers the relative clause, but Esperanto often uses participles more freely.

In this sentence, la is understood as introducing the whole noun phrase: la ... knabino.

Esperanto often puts la at the beginning of the entire noun phrase, even if there is a modifier before the main noun. So la veron konfesinta knabino means the girl who confessed the truth, not just girl in a vague sense.

This structure can feel unusual to English speakers because la is not right next to knabino.

Because veron konfesinta is a restrictive modifier: it identifies which girl is being talked about.

So the meaning is:

• the girl who confessed the truth

not:

• the girl, who confessed the truth, ...

In Esperanto, as in English, commas usually suggest extra, non-essential information. Here the information is essential.

Ne plu means no longer or not anymore.

• plu by itself is often used with a negative idea
• ne plu = not any longer

So:

• Ŝi ne plu hontas = She is no longer ashamed

This is a very common Esperanto expression.

Because honti is a verb meaning to be ashamed.

So:

• hontas = is ashamed

But honta is an adjective meaning shameful or causing shame, which is not the same thing.

Compare:

• Ŝi hontas = She is ashamed.
• Tio estas honta = That is shameful.

English often uses be + adjective, but Esperanto sometimes uses a simple verb instead.

Yes. A learner-friendly version would be:

• La knabino, kiu konfesis la veron, ne plu hontas.

That means the same thing in a more explicit way:

• kiu konfesis la veron = who confessed the truth

The original sentence is more compact and a bit more literary or formal in feel, but it is perfectly normal Esperanto.