'impressive-sounding nonsense words' means, big words. Words that you might think make you sound 'smart' but, nonetheless, words that the reader probably isn't familiar with (e.g., Sam is garrulous = Sam is talkative).Originally Posted by NewHope
The author is saying that it's important to know your audience. Use words the reader knows. The reason being, you want the reader to be able to understand what you are saying. If you use words that are too complicated--for a given audience--, you'll lose your reader. Know your audience. :D
Techincal terms are not 'big words' if they are used to refer to specialized language (e.g., Waste Management Engineer = garbageman/garbagewoman).
All the best, :D