To this end, I had sat well back on the form, and while seeming to be busy with my sum, had held my slate in such a manner as to conceal my face: I might have escaped notice, had not my treacherous slate somehow happened to slip from my hand, and falling with an obtrusive crash, directly drawn every eye upon me; I knew it was all over now, and, as I stooped to pick up the two fragments of slate, I rallied my forces for the worst.
…in the course of your future life you will often find yourself elected the involuntary confidant of your acquaintances’ secrets: people will instinctively find out, as I have done, that it is not your forte to tell of yourself, but to listen while others talk of themselves; they will feel, too, that you listen with no malevolent scorn of their indiscretion, but with a kind of innate sympathy; not the less comforting and encouraging because it is very unobtrusive in its manifestations."
There are no more uses of "unobtrusive" in the book.
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The web site has a lot of ads, but they are unobtrusively placed on the far right of the screen.