Încrederea este importantă.

Încredere means trust / confidence in the general, indefinite sense.

Încrederea means the trust or trust in a definite, specific sense. Romanian usually adds the definite article to the end of the noun, instead of putting a separate word like the in front.

So:

• încredere = trust
• încrederea = the trust

In this sentence, încrederea este importantă, Romanian is talking about trust as a definite concept: trust is important / the trust is important.

Romanian has a postposed definite article, which means the article is attached to the end of the noun.

For this feminine noun:

• încredere = trust
• încrederea = the trust

Here, the ending -a is the definite article.
This is very common in Romanian:

• fată = girl
• fata = the girl

So încrederea is not a different word entirely; it is încredere + the.

Because importantă describes încrederea, and adjectives in Romanian usually agree with the noun in gender and number.

Încrederea is a feminine singular noun, so the adjective must also be feminine singular:

• masculine singular: important
• feminine singular: importantă
• masculine plural: importanți
• feminine plural: importante

So:

• Băiatul este important. = The boy is important.
• Încrederea este importantă. = Trust is important.

The basic form you will usually find in a dictionary is important.

Romanian adjectives change form to match the noun:

• important = masculine singular
• importantă = feminine singular
• importanți = masculine plural
• importante = feminine plural

So importantă is just the feminine singular form of important.

In standard Romanian, the verb a fi (to be) is normally expressed, so este is needed here.

• Încrederea este importantă. = Trust is important.

Leaving out este would sound incomplete in standard Romanian.

Also, in everyday speech, Romanians often say e instead of este:

• Încrederea e importantă.

Both are correct, but este is a little more formal or careful.

A simple learner-friendly pronunciation guide could be:

uhn-kreh-DEH-reh-ah ES-teh im-por-TAN-tuh

A few key sounds:

• î in Încrederea is a Romanian vowel that does not exist in English. It is a close central sound, somewhat like saying uh with the tongue higher and more centered.
• e is usually like eh.
• ă in importantă is a short neutral vowel, similar to the a in sofa.

The stress is roughly:

• încreDErea
• ESte
• imporTANtă

They are two different Romanian vowels:

• î as in Încrederea: a close central vowel, a distinctive Romanian sound
• ă as in importantă: a schwa-like sound, similar to the last sound in English sofa

So they are not interchangeable.

This matters because Romanian spelling is quite phonetic, and changing these letters changes pronunciation and sometimes the word itself.

Because it is the first word of the sentence, so it is capitalized.

In Romanian, î becomes Î in uppercase.

So:

• lowercase: încrederea
• sentence-initial or uppercase: Încrederea

This is completely normal Romanian spelling.

It is a noun, specifically the subject of the sentence.

The structure is:

• Încrederea = the subject
• este = the verb
• importantă = the predicate adjective / subject complement

So the sentence literally has the structure:

Trust + is + important

Yes, Romanian word order is somewhat flexible, but this version is the most neutral and natural:

• Încrederea este importantă.

You could change the order for emphasis, but it would sound less neutral. For example:

• Importantă este încrederea.

This is more marked and emphasizes importantă or contrasts încrederea with something else.

For a beginner, the safest order is the original one.

It can mean either, depending on context.

Common uses include:

• a avea încredere în cineva = to trust someone
• a avea încredere în sine = to have confidence in oneself

So încredere covers both trust and confidence in many situations. In this sentence, the exact English choice depends on the context you were given, but grammatically the Romanian is the same.

Yes. Încrederea is the subject, so it is in the nominative.

In this sentence there is no special case ending you need to worry about beyond the normal definite form:

• încredere → încrederea

Romanian does have other case forms in some contexts, but here this is just the normal subject form.