He faced a frenzied attack.
The ants were in an excited, frenzied state.
little Jane frenzied the whole day because she didn't get what she wanted
The ants were in an excited, frenzied state because they found food.
When it has a subject, verb, punctuation, capitalization, a predicate, and a complete thought. A sentence is a sentence when it is handed down by a judge (or a magistrate).