All 3 Uses

impetuous
in
1776, by McCullough
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His defects were perceived to be a certain "nervous temperament" and susceptibility to poor health, impetuousness, and acute sensitivity to criticism.†
p. 22.6 *

impetuousness = impulsiveness (the trait of acting suddenly without much thought)
Knox wrote privately that while the loss of his six men had been a great misfortune, he consoled himself with the hope that the day's action had taught the rest to be less "impetuous" the next time.†
p. 139.9

impetuous = impulsive (acting suddenly without much thought)
Henry Clinton, in accounting for what happened, blamed the "impetuosity" of the light infantry for pursuing the rebels in the first place.†
p. 219.9

impetuosity = impulsiveness (the trait of acting suddenly without much thought)

Definitions:

(1) (impetuous as in: an impetuous decision)
impulsive (acting suddenly without much thought) -- often with an unfortunate consequence
(2) (meaning too rare to warrant focus)
In historic literature, impetuous often refers to any rapid, forceful, and/or violent movement.