Ruta je sigurna.

Because ruta is a feminine singular noun, and adjectives in Serbian must agree with the noun they describe.

So:

• masculine: siguran
• feminine: sigurna
• neuter: sigurno

Since ruta is feminine, the correct form is sigurna.

Je is the 3rd person singular present tense form of biti = to be.

So here it means is:

• Ruta = route
• je = is
• sigurna = safe

This is the normal way to make a sentence like The route is safe in Serbian.

In standard Serbian, no. You normally need je in this kind of sentence.

So:

• Ruta je sigurna. = correct
• Ruta sigurna. = not standard as a normal full sentence

Serbian often leaves out subject pronouns like ja, ti, on, but not the verb to be in a sentence like this.

Because Serbian does not have articles like English a/an/the.

So ruta can mean:

• a route
• the route

The exact meaning depends on context.

That is very normal in Serbian.

Yes, ruta is used in Serbian, especially for:

• travel routes
• transport routes
• GPS or navigation routes
• planned itineraries or paths

Depending on context, Serbian may also use other words such as put, putanja, or pravac, but ruta is perfectly normal.

It is in the nominative singular.

Why?

• ruta is the subject of the sentence
• subjects are normally in the nominative
• the adjective sigurna also appears in the nominative feminine singular to match it

So the sentence shows normal subject + verb + predicate adjective agreement.

Not always. The adjective siguran / sigurna / sigurno can mean different things depending on context, such as:

• safe
• secure
• sure
• certain
• confident

But with ruta, the natural meaning is safe or secure.

For example:

• Ruta je sigurna. = The route is safe.
• Ona je sigurna. = She is sure / confident.
• Siguran sam. = I am sure.

So context matters.

Ruta je sigurna is the most neutral and natural word order.

But Serbian word order is more flexible than English, so other orders can be possible for emphasis, for example:

• Sigurna je ruta.

This can sound more marked or emphatic, something like The route is safe with stress on safe.

For a learner, Ruta je sigurna is the best default pattern.

A simple English-friendly approximation is:

ROO-tah yeh SEE-goor-nah

A few helpful pronunciation notes:

• r is usually rolled or tapped
• j sounds like English y
• u sounds like oo in food
• g is always a hard g, like in go

So je sounds like yeh, not like English jee.

In Serbian Cyrillic, it is:

Рута је сигурна.

Serbian officially uses both:

• Latin: Ruta je sigurna.
• Cyrillic: Рута је сигурна.

Both are correct.

Yes, ruta is feminine.

A very common clue in Serbian is that nouns ending in -a are often feminine. That is not true in every single case, but it is a very useful general rule.

Because ruta ends in -a, it takes feminine agreement:

• dobra ruta
• sigurna ruta
• ova ruta

So in your sentence, sigurna confirms that ruta is feminine.

Yes. Bezbedna also means safe.

So both can work:

• Ruta je sigurna.
• Ruta je bezbedna.

There can be small differences in tone or preference depending on region and context, but both are natural Serbian. In many situations, bezbedan/bezbedna is very directly safe, while siguran/sigurna can be a little broader and can also mean secure or certain in other contexts.