Легеня дуже важлива.

In Ukrainian, the present-tense verb to be is often omitted in simple statements like this.

So:

• Легеня дуже важлива.
• literally: Lung very important
• natural English: The lung is very important.

This is completely normal Ukrainian. The idea of is is understood from the sentence structure.

Because the adjective has to agree with the noun.

Here:

• легеня = feminine, singular
• so the adjective must also be feminine singular
• therefore: важлива

Compare:

• важливий = masculine
• важлива = feminine
• важливе = neuter
• важливі = plural

And важливо is different: it is usually an adverb (importantly) or a neuter predicative form, not the normal agreeing adjective used here.

It is singular: lung.

The plural is легені = lungs.

So:

• Легеня дуже важлива. = The lung is very important.
• Легені дуже важливі. = The lungs are very important.

Легеня is feminine.

That is why the adjective is feminine too: важлива.

For an English speaker, this may feel surprising because biological sex is not relevant here. In Ukrainian, nouns have grammatical gender, and body-part words can be masculine, feminine, or neuter depending on the word.

In Ukrainian, many feminine nouns end in either -а or -я.

So легеня is not unusual. It is simply one of the feminine nouns with the -я ending.

For learners, the important practical point is:

• if a noun like легеня is feminine singular,
• its adjective will also take a feminine singular form,
• so you get важлива.

It is in the nominative singular.

That is because легеня is the subject of the sentence — the thing being described.

The adjective важлива is also in the nominative singular feminine, matching the noun.

Ukrainian has no articles like a or the.

So легеня can mean:

• a lung
• the lung
• or a general idea like the lung / lungs as an organ

The exact meaning depends on context. In a sentence like this, it often sounds like a general statement: The lung is very important or A lung is very important, depending on the situation.

Дуже means very.

Here it modifies важлива:

• дуже важлива = very important

Unlike adjectives and many nouns, дуже does not change for gender, number, or case. It stays дуже.

The word order can change, but Легеня дуже важлива is the most neutral and natural order.

This pattern is very common:

• [subject] + [adverb] + [adjective]

Changing the order usually adds emphasis or sounds more marked. For a learner, the given order is the safest default.

A rough pronunciation is leh-HE-nya.

A useful point for English speakers: Ukrainian г is usually pronounced more like a soft h sound, not like a hard English g.

So легеня sounds closer to leh-he-nya than leg-enya with a hard g.

The final -ня is like nya in canyon-type pronunciation, though not exactly the same.