when I bought coins as an investment, and over time the price of the coins I bought suddenly dropped considerably. so that's when it became my worst investment this year, and I hope that in the future it will not happen again.
I will say my worst investment decision is investing in thrive, they said on their website that they going to list on Bianance exchange and that made me to invest in the ICO but till this moment, they have not listed on bianance and their token has gone down so bad.
maybe in my opinion in the current conditions and situations the worst decision is actually not for us as investors because we know that all the risks we get in investing are very large if we think that the worst decision is why when we get a loss it is already an investment risk