All 5 Uses

impetuous
in
The Pathfinder, by Cooper
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"Is this prudent?" demanded Mabel, with an impetuosity that rendered her incautious in modulating her sweet voice.†
Chpt 7 *

impetuosity = impulsiveness (the trait of acting suddenly without much thought)
"Mabel!" said the guide, looking wistfully into the face of the generous and impetuous girl, as she held his two hard and sunburnt hands in her own pretty and delicate fingers, and laughing in his own silent and peculiar manner, while anguish gleamed over lineaments which seemed incapable of deception, even while agitated with emotions so conflicting,—"Mabel!†
Chpt 18

impetuous = impulsive (acting suddenly without much thought)
Mabel repeated her questions, endeavoring to repress the impetuosity of her feelings; and she succeeded in speaking so distinctly as to be understood.†
Chpt 20

impetuosity = impulsiveness (the trait of acting suddenly without much thought)
"Jasper Western is not one of these," said Mabel impetuously.†
Chpt 23

impetuously = impulsively (acting suddenly without much thought)
"And me, Pathfinder!" impetuously interrupted Mabel; "do you regret having known me?†
Chpt 29

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.