All 4 Uses

impetuous
in
The Idiot
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An impetuous woman, Lizabetha Prokofievna sometimes weighed her anchors and put out to sea quite regardless of the possible storms she might encounter.†
Chpt 2.8

impetuous = impulsive (acting suddenly without much thought)
She too, had passionate desires, but they were persistent rather than impetuous.
Chpt 4.1 *
He was, in his way, an impetuous man, and a quiet life of repentance in the bosom of his family soon became insupportable to him.†
Chpt 4.3
They came from her lips hurriedly and impetuously, and had been prepared and thought out long ago, even before she had ever dreamed of the present meeting.†
Chpt 4.8

impetuously = impulsively (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.