All 3 Uses

impetuous
in
Death Comes for the Archbishop
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When he joined Father Vaillant at coffee, that impetuous man who could never keep a secret asked him anxiously whether he had heard anything.†
Part 1 *

impetuous = impulsive (acting suddenly without much thought)
They did not know that it was the season when all the roving Navajo bands gather at the Canyon de Chelly for their religious ceremonies, and they rode on impetuously until they came out upon the rim of that mysterious and terrifying canyon itself, then swarming with Indians.†
Part 6

impetuously = impulsively (acting suddenly without much thought)
Father Latour checked his impetuous Vicar, and sat down on the sofa beside Madame Olivares, feeling very sorry for her and speaking very gently.†
Part 6

impetuous = impulsive (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.