"Sobering" means something that makes you serious or thoughtful, often by showing the truth about a situation or reminding you of the consequences and responsibilities involved. Full definition
He'll be happy to get you a burger with fries, and unless you like good old beer, you'll be staying sober for most of your time together. (freedatingservicesweb.com)
For entrepreneurs, it's yet another sign you may need to take a more sober view of things too. (inc.com)
Importantly is that the pant cut has to be in sober office style. (howomen.com)