الثقة مهمة.

In Arabic, the present tense of to be is usually not stated.

So الثقة مهمة literally looks like:

• confidence
  • important

But it naturally means:

• Confidence is important.

This kind of sentence is called a nominal sentence in Arabic.

The ة is called tāʾ marbūṭa. It often marks a word as grammatically feminine.

Here, مهمة is the feminine form of important because الثقة is a feminine noun. In Arabic, adjectives must agree with the noun they describe in:

• gender
• number
• definiteness

So:

• masculine: مهم
• feminine: مهمة

Yes, الثقة is grammatically feminine.

A very common clue is the ending ة. Many nouns ending in ة are feminine in Arabic. This is a matter of grammar, not biological sex. Abstract nouns are often feminine.

Because الثقة is feminine, the adjective must also be feminine:

• الثقة مهمة

not

• الثقة مهم

الـ is the Arabic definite article, meaning the.

So:

• الثقة = the confidence / confidence in a general sense
• مهمة = important (indefinite predicate adjective)

In Arabic nominal sentences, it is very common for the subject to be definite and the predicate to be indefinite.

So this structure is normal:

• الثقة مهمة

If you made both words definite, the sentence would no longer have the same simple structure.

It is pronounced roughly:

• ath-thiqa(h)

A few important points:

• ث sounds like th in think
• ق is a deep q sound, farther back than English k
• the ل of الـ is not pronounced here, because ث is a sun letter

So ال + ثقة becomes pronounced:

• ath-thiqa

not

• al-thiqa

In Arabic, some letters cause the ل in الـ to assimilate. These are called sun letters.

Since ث is one of them, the definite article is written:

• الثقة

but pronounced:

• ath-thiqa

The ل disappears in pronunciation, and the next consonant is emphasized.

This happens in many words, for example:

• الشمس → ash-shams
• الناس → an-naas

It is usually pronounced:

• muhimma(h)

In normal Arabic writing, short vowels are often left out, so learners have to know them from vocabulary study or context.

This word is often fully vocalized as:

• مُهِمَّة

Notice also that the middle م is doubled in pronunciation. That doubling is called shadda, even though it is not written in the unvocalized spelling here.

Fully vocalized, it would usually be:

• الثِّقَةُ مُهِمَّةٌ

Why?

• الثقةُ is the subject of a nominal sentence, so it is nominative
• مهمةٌ is the predicate, and it is also nominative

So the endings are:

• ـُ on الثقة
• ـٌ on مهمة

In everyday writing, these endings are usually omitted.

Because this is a simple nominal sentence:

• الثقة = the subject (mubtadaʾ)
• مهمة = the predicate (khabar)

In standard Arabic grammar, both the mubtadaʾ and the khabar are normally in the nominative case.

So in full form:

• الثقةُ مهمةٌ

The normal, neutral order is:

• الثقة مهمة

You can sometimes change word order in Arabic for style, emphasis, or rhetoric, but for a beginner the safest pattern is:

• subject + predicate

So stick with:

• الثقة مهمة

If you reverse things carelessly, you may create a sentence that sounds unusual or changes the structure.

Here it is functioning as an adjective meaning important.

But the same written form مهمة can also be a noun meaning task or mission, depending on context.

So Arabic learners often need context to know which meaning is intended.

In this sentence, because the meaning is Confidence is important, مهمة is clearly the adjective.

Not always. Depending on context, ثقة can relate to ideas like:

• confidence
• trust
• reliability

But in this sentence, the intended meaning is the abstract idea confidence.

This kind of semantic flexibility is common in Arabic vocabulary, especially with abstract nouns.