Sin duda, es importante.

It is undoubtedly important.

Breakdown of Sin duda, es importante.

• ser: to be
• importante: important
• sin duda: undoubtedly

Questions & Answers about Sin duda, es importante.

What kind of expression is sin duda?

Sin duda is a fixed adverbial expression. It works like certainly, undoubtedly, or without a doubt in English.

Grammatically, it is made of:

• sin = without
• duda = doubt

Even though it literally looks like without doubt, you should learn it as a set phrase.

Why is there no article before duda?

In Spanish, some fixed expressions use a noun without an article. Sin duda is one of them.

Compare:

• sin duda = a standard expression meaning undoubtedly
• sin la duda would sound unnatural here

This is similar to other common patterns with sin, such as:

• sin problema
• sin miedo
• sin razón

So the short answer is: because this is the normal idiomatic expression.

Why is it es importante and not está importante?

Spanish usually uses ser for general qualities, definitions, or essential characteristics, and estar for states or conditions.

Here, importante is describing something as being important in a general sense, so ser is the natural choice:

• Es importante = It is important

Está importante would normally not be used in this context in standard Spanish.