All 4 Uses

impetuous
in
Silas Marner
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Suddenly a deep flush came over his face, and he was about to speak impetuously, when he seemed checked again by some inward shock, that sent the flush back and made him tremble.†
Chpt 1.1

impetuously = impulsively (acting suddenly without much thought)
"Confound you, hold your tongue!" said Godfrey, impetuously.†
Chpt 1.3
"It drives me past patience," said Priscilla, impetuously, "that way o' the men—always wanting and wanting, and never easy with what they've got: they can't sit comfortable in their chairs when they've neither ache nor pain, but either they must stick a pipe in their mouths, to make 'em better than well, or else they must be swallowing something strong, though they're forced to make haste before the next meal comes in.†
Chpt 2.17
"I can't feel as I've got any father but one," said Eppie, impetuously, while the tears gathered.
Chpt 2.19 *

impetuously = impulsively (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.