Do you know that knell means "the sound of a bell rung slowly to announce a death," or that cavort means "to play boisterously"? What about the meaning of impecunious? ("Not having enough money to pay for necessities.") While these words might not be used very often in speech today, the creators of the SAT apparently found them to be of sufficient importance to include in their college assessment tests over the years.
Whether you have a penchant for locution or find SAT vocabulary onerous, learning a few more words is never pernicious. In fact, doing so serves the utilitarian purpose of improving your communication, reading and language skills; you can also use these words to make your prose a little more florid, if you wish. Be assiduous not to fall into grandiloquence, though, lest you sound like an ignoramus! (No, you can't possibly impute that I sound like one!)
Now it's time to test your vocabulary acumen with the following quiz. If you don't know the meaning of all the words in these past few paragraphs, you can definitely take that as a portent of what's to come...
OK, don't be timorous or diffident. Just give it a try!