Поразка сумна.

In Ukrainian, the verb to be is usually left out in the present tense in simple sentences like this.

So:

• Поразка сумна = The defeat is sad

Literally, it is just defeat sad, but Ukrainian grammar understands the missing is automatically.

If you change the tense, then a form of бути appears:

• Поразка була сумна = The defeat was sad
• Поразка буде сумна = The defeat will be sad

Ukrainian has no articles like a or the, so the exact English version depends on context.

Поразка сумна could be understood as:

• The defeat is sad
• A defeat is sad
• Defeat is sad

In real life, context usually makes it clear which one is meant. In a standalone example, English learners often translate it as The defeat is sad.

Because Ukrainian adjectives must agree with the noun they describe in gender, number, and case.

Here:

• поразка is feminine
• singular
• nominative case

So the adjective must also be feminine singular nominative:

• masculine: сумний
• feminine: сумна
• neuter: сумне
• plural: сумні

Since поразка is feminine, сумна is the correct form.

Because сумна is an adjective, while сумно is usually an adverb or a predicative word.

In this sentence, the word is describing the noun поразка, so you need an adjective:

• Поразка сумна = The defeat is sad

By contrast, сумно is used in sentences like:

• Мені сумно = I am sad / I feel sad
• Це сумно = This is sad

So:

• сумна = adjective, agrees with a feminine noun
• сумно = adverb/predicative form, not used here with поразка

Поразка is:

• a noun
• feminine
• singular
• nominative case

It is the subject of the sentence.

The nominative is the basic dictionary form, so if you look up the word, you will usually find поразка.

Yes, but that usually changes the structure and meaning slightly.

• Поразка сумна = The defeat is sad
  This is a full sentence.

• Сумна поразка = a sad defeat
  This is usually a noun phrase, not a full sentence.

So the difference is similar to:

• The defeat is sad
• a sad defeat

Ukrainian word order is flexible, but in a simple learner example, Поразка сумна is the clearer full sentence.

The stress is:

• пора́зка
• су́мна

A rough English-style approximation is:

• po-RAHZ-ka SOOM-na

A few helpful notes:

• у sounds like oo in boot
• the r is usually tapped or rolled more than in English
• pronounce both consonants in зк in пора́зка

No, Ukrainian word order is more flexible than English word order. But word order can affect emphasis and sometimes how natural a sentence sounds.

Поразка сумна is a normal way to express:

• The defeat is sad

If you move words around, the sentence may sound more marked, poetic, or context-dependent.

For learners, it is safest to understand this pattern as:

• noun + adjective in a present-tense sentence with no is

Here are the most useful changes:

• Поразка не сумна = The defeat is not sad
• Поразки сумні = The defeats are sad
• Поразка була сумна = The defeat was sad
• Поразка буде сумна = The defeat will be sad

Notice that the adjective changes in the plural:

• singular feminine: сумна
• plural: сумні