So ... I'd like to make one of my supporting characters "sound" permanently nervous and/or scared. (I don't mean body language, but I mean through his speech).
The story-world I'm writing has a proto-zombie invasion, but these zombies are just as smart, quick and strong as humans -- and they have one or two extra powers. (I'm rootin' for the zombies).
So, naturally, my character would be afraid of them.
He's also afraid because he's poor, tried his hand at thievery, got caught, and is now on the run. He's running away both from the people who caught him (who aren't that bothered about catching him), and the very powerful crime family that saw him try to steal (and they're definitely bothered about catching him, because he's making them look bad).
The only person protecting him is my MC, a fair-to-middling warrior-type, who thinks that he's disgusting because she's upper-class ... and he's definitely not.
But she needs his help, because their quest will take them into the terrain he knows well, and she doesn't. (Mwa ha ha).
Just to clarify: she's not an Upper-Class Twit with her nose in the air, but she doesn't particularly like this guy. On the other hand, he doesn't like her right back, so that makes them even.
And as they start their voyage, it's clear that his knowledge is useful, so my MC starts having second thoughts. Maybe he's not so bad after all. Maybe I was too harsh on him. Maybe it could be the start of her "redemption" arc. (Don't worry, there's a long way to go yet!) 
So, what do you think? How can I make this guy "sound" nervous and/or scared?
One other thing I should note: he's not book-smart, but more "wilds-savvy" (like street-savvy, but he knows more about the wilds and the great outdoors). I thought I could bring that forward with bad grammar or contractions (like "ain't" and so on), but I'm not sure how to write characters like this. Any ideas?
Thanks so much for your help!
The story-world I'm writing has a proto-zombie invasion, but these zombies are just as smart, quick and strong as humans -- and they have one or two extra powers. (I'm rootin' for the zombies).

He's also afraid because he's poor, tried his hand at thievery, got caught, and is now on the run. He's running away both from the people who caught him (who aren't that bothered about catching him), and the very powerful crime family that saw him try to steal (and they're definitely bothered about catching him, because he's making them look bad).
The only person protecting him is my MC, a fair-to-middling warrior-type, who thinks that he's disgusting because she's upper-class ... and he's definitely not.


Just to clarify: she's not an Upper-Class Twit with her nose in the air, but she doesn't particularly like this guy. On the other hand, he doesn't like her right back, so that makes them even.


So, what do you think? How can I make this guy "sound" nervous and/or scared?

One other thing I should note: he's not book-smart, but more "wilds-savvy" (like street-savvy, but he knows more about the wilds and the great outdoors). I thought I could bring that forward with bad grammar or contractions (like "ain't" and so on), but I'm not sure how to write characters like this. Any ideas?
Thanks so much for your help!
