Unfast'ns: on a sudden op'n flie With impetuous recoile and jarring sound Th' infernal dores, and on thir hinges great Harsh Thunder, that the lowest bottom shook Of Erebus. She op'nd, but to shut Excel'd her power; the Gates wide op'n
— John Milton
For behold, I am raising up the Chaldeans—that ruthless and impetuous nation which marches through the breadth of the earth to seize dwellings not their own.
— Habakkuk 1:6
Trump as the man nearly everyone knew him to be: erratic, unfocused, impetuous, likely not of sound mind.