Shakespeare spoke an older form of English, so we can assume that the question is the definition of the term "beef-witted" in English. In English, beef-witted means stupid or dull, to have the intelligence or wits of a cow.

Witted' means 'possessing a mind', and it is often used with an adjective describing what kind of mind the person possesses. For example, a person might be quick-witted or sharp-witted.

My little brother was quick-witted when we left our lights on.

He was quick-witted and never at a loss for a smart answer.

The quick-witted brown fox jumped over the lazy-bones dog.

My little brother was quick-witted when we left our lights on.

He was quick-witted and never at a loss for a smart answer.

The quick-witted brown fox jumped over the lazy-bones dog.

the man in the play was so dim-witted for that part