I know that many grammar rules that used to be widely followed in
the past no longer seem so important nowadays. BUT this
was NOT the point I was making! I was only pointing out that
the word 'agitated' is not a verb as such,
In fact (to) be 'endlessly agitated' is what is called an 'adjectival phrase' in which the adjective 'agitated' (which answers to the
question 'to be what?') is qualified by the adverb 'endlessly'.
One of its synonyms happens to be a verb, just as 'to begrudge'
is the verbal synonym of the phrase 'to be GREEN WITH ENVY', in
which 'green with envy' also answers the question 'to be what?'