Who was American singer songwriter author and visual artist who was often regarded as one of the greatest songwriters of all time?

Bob Dylan

dumb or stupid what is more professional?

Neither "dumb" nor "stupid" are considered professional terms. It is generally recommended to use more neutral and respectful language in professional settings.

like what?

In professional settings, it is advisable to use language that is clear, objective, and respectful. Instead of using "dumb" or "stupid," you could consider using more neutral terms such as:

- Uninformed
- Inexperienced
- Lacking knowledge
- Not well-versed
- Challenging
- Difficult to understand

Choosing appropriate language is important to maintain a professional and respectful environment.

The American singer-songwriter, author, and visual artist who is often regarded as one of the greatest songwriters of all time is Bob Dylan. To find the answer to this question, you can either use your existing knowledge about famous musicians or you can do an online search by typing relevant keywords such as "famous American singer-songwriters" or "greatest songwriters of all time." This will lead you to various sources, including biographies, rankings, and articles, where you can confirm that Bob Dylan is commonly acknowledged as one of the greatest songwriters.