The word "downside" refers to the negative aspects or disadvantages of a situation or decision. It highlights the potential problems or drawbacks that may come with something. Full definition
The only downside of using a glass baby bottle is that it is heavy and if you drop it, it breaks. (babieslounge.com)
That seems to be the only downside of what you wrote. (nourishinghope.com)
Am I more scared of downside risk with a small emergency fund, or am I more scared of losing a fair amount of earned interest over the years? (budgetsaresexy.com)