القوة مهمة.

• القوة = the strength, the power, or the force, depending on context
• مهمة = important in the feminine singular form

So the sentence means something like Strength is important or Power is important.

In Arabic, the verb to be is usually omitted in simple present-tense sentences like this.

So:

• القوة مهمة = Strength is important
• literally, it is closer to the strength important

This is completely normal in Arabic. If you wanted a past-tense meaning, Arabic would use a verb such as كانت or كان.

This is a nominal sentence in Arabic, called جملة اسمية.

It has two main parts:

• القوة = the subject/topic, often called مبتدأ
• مهمة = the predicate/comment, often called خبر

So the structure is:

• القوة = what we are talking about
• مهمة = what we are saying about it

In English terms, it works like Strength is important.

القوة is a grammatically feminine noun. In Arabic, nouns have grammatical gender, and that does not always match biological sex. Abstract nouns are often feminine, and قوة is one of them.

Because القوة is feminine, the adjective or predicate that describes it must also be feminine:

• masculine: مهم
• feminine: مهمة

So القوة مهمة is correct.

You would not normally say القوة مهم in standard Arabic, because that would break gender agreement.

This is very common in Arabic nominal sentences.

• القوة is definite: the strength / strength as a concept
• مهمة is indefinite: important

In a sentence like this, the predicate is often indefinite.

This difference also helps show that this is a full sentence, not just a noun phrase.

Compare:

• القوة مهمة = Strength is important
• القوة المهمة = the important strength/power

So adding ال to both words would change the structure and meaning.

The fully vowelled form is:

القُوَّةُ مُهِمَّةٌ

In careful formal reading, this would be pronounced approximately:

al-quwwatu muhimmatun

Why these endings?

• القوةُ has ـُ because it is the subject of the nominal sentence
• مهمةٌ has ـٌ because it is the predicate and is indefinite

In everyday speech, news-style Arabic, or classroom pronunciation, people often drop the full case endings and say something closer to:

al-quwwa muhimma

A good approximation is:

al-quwwa

A few useful points:

• ال is pronounced al-
• the ق is a deep q sound, not an English k
• the وّ has a shadda, so the w sound is doubled: quwwa
• the final ة is usually heard as a in pause

Also, the ل in ال does not assimilate here, because ق is a moon letter, not a sun letter. So it stays al-quwwa, not something like aq-quwwa.

Yes. القوة can mean several related things, depending on context:

• strength
• power
• force
• sometimes might

So this sentence could be translated in different ways:

• Strength is important
• Power is important
• Force is important

The best choice depends on the situation and the wider context.

Yes. مهمة can also be a noun meaning mission or task.

But in this sentence, it is understood as the adjective important.

Why?

Because the sentence structure naturally reads as:

• القوة = subject
• مهمة = predicate adjective

So here the intended meaning is important, not mission.

This kind of double meaning is common in Arabic, and context usually makes the meaning clear.