Delivering speeches is not about showing off your extensive vocabulary. There's no need to try to impress audiences with the length of words that you know. Consider the following paragraph from Richard Dowis, author of "The Lost Art of the Great Speech";
"Short words can make us feel good. They can run and jump and
dance and soar high in the clouds. They can kill the chill of a cold
night and help keep us cool on a hot day. They fill our hearts with joy,
but can bring tears to our eyes as well. Small words of love can move
us, charm us, lull us to sleep. Short words give us light and hope and
peace and love and health - and a lot more good things. A small word can
be as sweet as the taste of a ripe pear, or tart like plum jam."
Each word in that paragraph is just one syllable, yet they
still have the power to evoke powerful feelings and strong emotions. Speechwriters know
that short, simple words are often the most powerful elements of great
speeches, and brilliant speakers know that too. In the words of Ralph
Waldo Emerson : "An orator is never successful until they learn to make their words smaller than their ideas"
When you prepare a speech, look at the words you are using.
Could they be simpler? Is there a way of expressing your ideas in
shorter words? You may well find that the impact is more powerful when
you trim it down.