Do you think that "limpid" has something to do with hobbling around on an injured leg? Bob Bly who may well deserve the sobriquet of America's most successful advertising writer has elucubrated a glossary of must-know words if you have any hope at all of not being tagged as a hopelessly inept social klutz.
This is a fun book. It may not make you the life of the party, but heads will turn when you open your mouth and knowledgeably utter a string of these words that aren't generally lingua franca among the hoi polloi.
I'm not sure whether Bly authored this tome with tongue in cheek, but I do know that most of us could stand to put a little more substance into our vocabularies. Even if you cause others to stretch a little bit. So go ahead, add a dash of eloquence, increase your sense of mystery, enhance your charisma and stop sounding exactly like every other dumb clunk. Just don't overdo it. A good vocabulary is like adding spice to a dish, just a dash will do you.
The best speech is still just lucid, to the point and entertaining. It's what I've tried to do with my book Postcards. Little Letters From Life Check it out and see what I mean.