I'm sorry to be such a marplot, but you can take it out in quizzing me after I'm gone.
Marplot, an officious bungler, who spoils everything he interferes with.
Our only marplot has been laid by the heels at the very nick of time.
Did Ralston know that he had been considered a sort of marplot?
“And I have been the marplot to spoil this merry company,” said Mr. Owen contritely.