Babbitt had so strong an impulse to go to Paul that he could feel his body uncoiling, his shoulders moving, but he felt, desperately, that he must be diplomatic, and not till he saw Paul paying the check did he bluster to the piano-salesman, "By golly-friend of mine over there—’scuse me second—just say hello to him."
There are no more uses of "diplomatic" in the book.
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cannot be arrested because he enjoys diplomatic immunity
Despite his outrage, he managed a diplomatic reply.