"It's hard to pick what is the most alarming number in the troubling trail of new lows for President Donald Trump," said Quinnipiac's assistant director Tim Malloy in a statement. "Profound embarrassment over his performance in office and deepening concerns over his level-headedness have to raise the biggest heads."
(The question, "Would you say Donald Trump is level-headed" is at "71% No" -- up 14 points since the election.)
There are a great many other poll results, broken down into small categories. Pretty much all very bad for Trump. You can see all the results here.