There, during the winter, he had heard of her (as one always heard of pretty women in Washington) as shining in the "brilliant diplomatic society" that was supposed to make up for the social short-comings of the Administration.
His father, who had died young, had filled a small diplomatic post, and it had been intended that the son should follow the same career; but an insatiable taste for letters had thrown the young man into journalism, then into authorship (apparently unsuccessful), and at length—after other experiments and vicissitudes which he spared his listener—into tutoring English youths in Switzerland.
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.