I suspect the only way to do that is to either assign No Language or No Break to those words, and that would be a daunting task.
Thanks for your quick response. I'm looking for a way to not hyphenate all words that are not in dictionary, which include names and other words. Entering all the words manually, like you said, would be counterproductive as the words are always different. Not exactly a time saver! Thanks anyhow.