No estoy enfadado; simplemente estoy cansado.

Because enfadado and cansado describe temporary states, not permanent characteristics.

In Spanish, that usually means you use estar, not ser:

• estoy enfadado = I am angry / I’m angry right now
• estoy cansado = I am tired

If you used soy, it would sound like you were talking about someone’s essential nature or personality, which does not fit well with cansado and normally does not fit with enfadado either.

So:

• No estoy enfadado = I’m not angry
• No soy enfadado is not the normal way to say that

If you wanted to talk about someone’s general personality, you might say something like:

• No soy una persona enfadiza = I’m not an irritable person

In standard Spanish, it is most natural to repeat estoy:

• No estoy enfadado; simplemente estoy cansado.

That is clear and fully grammatical.

Spanish can sometimes leave out repeated words when the meaning is obvious, but with this sentence, omitting the second estoy would sound less complete and less natural in careful standard Spanish.

So a learner should usually say:

• No estoy enfadado, simplemente estoy cansado.

not:

• No estoy enfadado, simplemente cansado.
  This may be understood, but it is not the best model to copy.

Yes. In Spain, enfadado is a very common word for angry, annoyed, or upset.

Examples:

• Estoy enfadado contigo. = I’m angry with you.
• Se ha enfadado. = He/She got angry.

This is especially useful for Spain Spanish. In many parts of Latin America, learners often hear other words more often, such as:

• enojado
• molesto (depending on context)

But for Spain, enfadado is absolutely natural.

Because both enfadado and cansado are adjectives in the masculine singular form, matching the speaker if the speaker is male or if the masculine form is being used generically.

The forms change depending on gender and number:

• masculine singular: enfadado, cansado
• feminine singular: enfadada, cansada
• masculine plural: enfadados, cansados
• feminine plural: enfadadas, cansadas

So a woman would say:

• No estoy enfadada; simplemente estoy cansada.

A group of women would say:

• No estamos enfadadas; simplemente estamos cansadas.

In this sentence, they function as adjectives.

It is true that forms ending in -ado or -ido often come from past participles, but many of them are also commonly used as adjectives.

Here:

• enfadado describes the person’s state
• cansado describes the person’s state

So you should think of them here as adjectives used with estar.

Simplemente means simply.

It softens or clarifies the statement:

• No estoy enfadado = I’m not angry
• simplemente estoy cansado = I’m simply tired / just tired

It helps show contrast: the problem is not anger, but tiredness.

It is similar to English simply or just in this kind of sentence.

Yes, often you can.

For example:

• No estoy enfadado; solo estoy cansado.
• No estoy enfadado; simplemente estoy cansado.

Both are natural. The difference is slight:

• solo = just / only
• simplemente = simply

In everyday speech, solo may sound a bit more direct and conversational. Simplemente can sound slightly more explanatory or emphatic.

In this sentence, both work well.

Because Spanish normally makes a sentence negative by putting no directly before the conjugated verb.

So:

• Estoy cansado. = I’m tired.
• No estoy cansado. = I’m not tired.

Here:

• No estoy enfadado = I’m not angry

This is the standard way to negate a statement in Spanish.

No, it is not necessary.

The semicolon in:

• No estoy enfadado; simplemente estoy cansado.

shows a strong pause between two closely related ideas. It is correct, but in everyday writing many people would just use a comma:

• No estoy enfadado, simplemente estoy cansado.

In speech, you would normally just pause slightly. So as a learner, you can understand the semicolon as a punctuation choice, not a grammar requirement.

Yes. Depending on context, enfadado can be translated as:

• angry
• annoyed
• upset

And simplemente can be:

• simply
• just

So possible natural translations include:

• I’m not angry; I’m simply tired.
• I’m not upset; I’m just tired.
• I’m not annoyed; I’m just tired.

The best English version depends on tone and context.

Not exactly. The verb stays the same, but the adjectives usually change to the feminine form:

• No estoy enfadada; simplemente estoy cansada.

This is because Spanish adjectives often agree with the speaker’s gender.

So:

• male speaker: enfadado, cansado
• female speaker: enfadada, cansada

That agreement is very important in Spanish.