O espírito está tranquilo.

O is the masculine singular definite article, meaning the.

So o espírito = the spirit.

In Portuguese, articles are used very naturally and often more regularly than in English. In this sentence, o tells you we are talking about a specific spirit, or about the spirit as a known idea in context.

• o = masculine singular
• a = feminine singular
• os = masculine plural
• as = feminine plural

Because espírito is masculine singular, it takes o.

You usually learn the noun together with its article: o espírito.

Even though many nouns ending in -o are masculine, the safest habit is to memorize nouns with the article, because endings do not always guarantee gender in Portuguese.

Here:

• o espírito = masculine
• so adjectives that describe it also need to be masculine singular

That is why the sentence says tranquilo, not tranquila.

Because adjectives in Portuguese usually agree with the noun they describe in gender and number.

Since espírito is masculine singular, the adjective must also be masculine singular:

• o espírito está tranquilo
• a alma está tranquila

Compare:

• o menino está tranquilo = the boy is calm
• a menina está tranquila = the girl is calm

So tranquilo matches espírito.

This is a very common question, because Portuguese has two verbs that can both translate as to be:

• ser → usually for identity, definition, permanent characteristics
• estar → usually for states, conditions, locations, temporary situations

Here, tranquilo describes a current state or condition, so Portuguese uses estar:

• O espírito está tranquilo. = The spirit is calm.

If you used é tranquilo, it would sound more like a general characteristic: it is calm / it is a calm one by nature.

So in this sentence, está is the natural choice.

Está is the third person singular of estar in the present tense.

Conjugation of estar in the present:

• eu estou
• você / ele / ela está
• nós estamos
• vocês / eles / elas estão

So o espírito está literally means the spirit is.

The accent in está is written because that is the standard spelling of this verb form.

The accent mark shows where the stress goes.

espírito is stressed on the pí syllable:

• es-PÍ-ri-to

Without the accent, Portuguese spelling rules would suggest a different stress pattern, so the accent is necessary.

It also helps you pronounce the word more naturally in Brazilian Portuguese.

A rough English-friendly pronunciation is:

• o es-PEE-ree-too es-TAH trahn-KEE-loo

That is only approximate, but the important stress is:

• es-PÍ-ri-to
• es-TÁ
• tran-QUI-lo

Usually, no—not in a neutral everyday sentence.

O espírito está tranquilo is the normal full version.

If you remove the article and say Espírito está tranquilo, it sounds unnatural in most ordinary contexts. Portuguese generally wants the article here.

You might see article omission in:

• titles
• poetry
• very formal or religious style
• special fixed expressions

But for a normal learner sentence, keep o.

Not necessarily. Espírito can have several meanings depending on context, such as:

• spirit in a religious or philosophical sense
• soul
• mind/spirit in a figurative sense
• in some contexts, even a supernatural being

So the exact nuance depends on the larger situation.

For example, it could refer to:

• a person’s inner spirit
• a spiritual presence
• a figurative mood or essence

That is normal in Portuguese, just as spirit in English can also have more than one meaning.

In Portuguese, adjectives often come after the noun:

• o espírito tranquilo
• um homem feliz
• uma casa grande

So it is completely normal to say:

• O espírito está tranquilo.

Portuguese can sometimes place adjectives before the noun, but that usually changes the tone, emphasis, or style. For a basic descriptive sentence, noun + adjective is the standard pattern.

Very simply:

Negative:

• O espírito não está tranquilo.
• The word não goes before the verb.

Question:

• O espírito está tranquilo?

In Brazilian Portuguese, you usually make a yes/no question with intonation rather than changing the word order.

So:

• statement: O espírito está tranquilo.
• question: O espírito está tranquilo?

The words stay the same; your voice rises at the end in speech.

A rough learner-friendly pronunciation is:

u es-PEE-ree-tu es-TAH trahn-KEE-lu

A few helpful notes:

• o by itself, as the article, is often pronounced like u
• espírito has stress on PÍ
• está has stress on TÁ
• tranquilo has stress on QUI

A more natural Brazilian rhythm would sound something like:

u es-PÍ-ri-tu es-TÁ trã-KI-lu

The exact sounds vary by region, but those stress points are the key thing to get right.