You added the adjective "serious" to misdemeanors, which is not in the Constitution. The "high" in "high crimes and misdemeanors" means crimes and misdemeanors committed by high officials, not crimes and misdemeanors that are extreme.
impeached
As Trump showed, impeachment doesn't mean shit. Actual removal requires a 2/3 majority of the Senate, which is never ever happening.This is why there is a general sense that the POTUS is now more or less completely untethered from any possible consequences for his actions.