
Have your character do something compulsive, like pull out their third stick of gum in 2 minutes, or pull their socks up repeatedly, in hopes that that will help hold them in place. Your character could do something completely out of character, or give in to an old vice, like having one smoke, just this once, because it’s only once. Make your character wonder if people are wondering why your character needs to piss so badly. Maybe your character checks the thermostat and wonders how the room can be so cold when the heat is set to 75°. Think of some of the things that might cause your knees to shake that have nothing to do with nervousness. If you want to avoid being boring you avoid even alluding to the nervousness at all. Perhaps even ask someone specific that your character may remind you of, if possible.

If you cannot remember how you behave when nervous (It'd surprise me a little, but) ask someone else how they felt and or acted last time they were nervous. Think of something that made you nervous - how did you act/react? the what makes the character nervous could in this case be what he's paying attention to When you describe the qualities of an emotion/feeling/state that someone is in, the reader is more likely to feel that emotion, rather than just "know what you mean". You can use whichever suits your characters and the situation they're in. the list goes uses most of these in his example in his answer.paying attention to certain details, either relevant or not.


Not a lot to misinterpret, but not a lot for the reader to feel either. There are simple and less simple answers to these kinds of questions that will give you different results.
