blunder

“I assure you it is just as hateful to me to fail in a case as it can be to you to blunder over a commission.”

“You are mistaken in thinking so,” returned Franz calmly; “but you merely fall into the same error which leads so many of our countrymen to commit the most egregious blunders,—I mean that of judging the habits and customs of Italy and Spain by our Parisian notions; believe me, nothing is more fallacious than to form any estimate of the degree of intimacy you may suppose existing among persons by the familiar terms they seem upon; there is a similarity of feeling at this instant between ourselves and the countess—nothing more.”