Sentence:  How would you, or how do you think I should, relish being the object of such a letter as Kean wrote t'other day to a poor author, who, though a pedantic blockhead, had at least the right to be treated as a gentleman by a copper-laced two-penny <WSD>tearmouth</WSD>, rendered mad by conceit and success? 
Meaning of the word marked with <WSD> tags:  An overactor.