Moja namjera nije bila loša.

Because namjera is a feminine singular noun.

In Croatian, possessive words like moj / moja / moje must agree with the noun they describe in:

• gender
• number
• case

Since namjera is feminine singular, the correct form is moja.

Compare:

• moj plan = my plan (masculine)
• moja namjera = my intention (feminine)
• moje pismo = my letter (neuter)

It is in the nominative singular.

Why? Because namjera is the subject of the sentence — it is the thing being talked about.

In Moja namjera nije bila loša, the structure is basically:

• Moja namjera = subject
• nije bila = was not
• loša = bad

So namjera stays in the nominative.

Bila is the feminine singular past participle of biti (to be).

Croatian past tense usually uses:

• a present-tense form of biti
• plus the l-participle

Here, the subject is namjera, which is feminine singular, so the participle must also be feminine singular:

• bio = masculine singular
• bila = feminine singular
• bilo = neuter singular
• bili / bile / bila = plural forms

So:

• Namjera je bila... = The intention was...
• Namjera nije bila... = The intention was not...

Because nije is the normal negative present form of biti used in the Croatian perfect tense.

The positive version is:

• je bila = was

The negative version is:

• nije bila = was not

So the negation is built into nije.

Examples:

• On je bio umoran. = He was tired.

• On nije bio umoran. = He was not tired.

• Namjera je bila loša.
• Namjera nije bila loša.

Because loša agrees with namjera, which is feminine singular nominative.

After biti (to be), Croatian often uses an adjective that matches the subject:

• loš = masculine singular
• loša = feminine singular
• loše = neuter singular

Since namjera is feminine singular, the adjective must also be feminine singular:

• Moja namjera nije bila loša.

If the noun changed, the adjective would change too:

• Moj plan nije bio loš. (masculine)
• Moje objašnjenje nije bilo loše. (neuter)

Yes, in this kind of sentence, the adjective is normally in the nominative, matching the subject.

So:

• namjera = nominative feminine singular
• loša = nominative feminine singular

This is similar to sentences like:

• Ona je sretna. = She is happy.
• Kuća je velika. = The house is big.

The adjective describes the subject, so it agrees with it.

The neutral word order is:

• Moja namjera = subject
• nije bila = verb phrase
• loša = complement

So:

Moja namjera nije bila loša.

This is the most straightforward, neutral version.

Croatian word order is somewhat flexible, but changing the order can change the emphasis. For example:

• Nije bila loša moja namjera.
  This sounds marked or emphatic, not neutral.

For a learner, Moja namjera nije bila loša is the safest standard order.

Yes. You can say:

Namjera nije bila loša.

That means The intention was not bad or The intention wasn’t bad.

Adding moja makes it specifically my intention.

Croatian often leaves out things that are clear from context, so whether you include moja depends on how explicit you want to be.

Yes, sometimes Croatian speakers might use a slightly different structure, such as:

• Namjera mi nije bila loša.

This literally looks like The intention to me was not bad, but in natural English it means the same as My intention was not bad.

Here:

• mi = to me / my, in an indirect possessive sense

Both are correct:

• Moja namjera nije bila loša.
• Namjera mi nije bila loša.

The second one can sound a bit more natural in conversation.

Yes, namjera is a normal and common Croatian word meaning intention.

It is often used in contexts involving:

• motives
• purpose
• whether someone meant well or badly

Examples:

• Imam dobru namjeru. = I have a good intention / I mean well.
• To nije bila moja namjera. = That was not my intention.

So in your sentence, namjera fits very naturally.

Because Croatian does not have articles like English a and the.

So namjera can mean:

• intention
• the intention
• sometimes an intention

The exact meaning depends on context.

In this sentence, English usually needs an article or possessive:

• My intention was not bad.

Croatian expresses that idea without articles.

The positive version is:

Moja namjera je bila loša.

That means My intention was bad.

You may also hear or see Moja namjera bila je loša, because clitic placement in Croatian can vary depending on style and structure. But for learners, the easiest contrast is:

• je bila = was
• nije bila = was not

So:

• Moja namjera je bila loša.
• Moja namjera nije bila loša.

It is pronounced roughly like nee-yeh.

A simple breakdown:

• ni- = like nee
• -je = like yeh

So:

• nije ≈ NEE-yeh

This combination is very common in Croatian because it is the negative form of je in many sentences:

• nije dobro = it is not good
• nije bio = he was not
• nije bila = she/it (feminine) was not

Yes, it can carry that kind of nuance.

Even though the literal structure is about my intention, in actual use it can sound like:

• I didn’t mean any harm
• My intentions were not bad
• I meant well

The exact English wording depends on context, but grammatically the Croatian sentence is still singular:

• namjera = intention

If you wanted the plural intentions, you would say:

• Moje namjere nisu bile loše. = My intentions were not bad.