A condition afflicting people who are sensitive to sound. People who suffer from noise aversion become very uncomfortable, physically and/or mentally, when in the vicinity of noise which may be tolerable to the vast majority of others.
"Steve doesn't like going to bars or clubs because he suffers from noise aversion."
The act of blending into one's surrounding so as to not provoke notice from others.
"I can barely remember that girl from last night."
"Yeah, she was pretty dim."