Brief writing is more formal than conversation. You may say to a colleague that banking regulators are “super sensitive” to issues of integrity because the industry handles so much money, but in a brief, you would not write “super sensitive.” If you used any intensifier, you would write that banking regulators are “very” or “extremely” (not “super”) sensitive to issues of integrity.
“Super” is too casual. It presumes an intimacy you haven’t earned, which may offend the reader. The familiar tone may also suggest you aren’t taking your advocacy seriously, which in turn may suggest that the righteousness of your cause isn’t manifest enough for you to feel comfortable being formal and indignant. If you can be casual in the face of the wrong done to your client, how serious a wrong could it be?
