She was fond of her children in an uneven, impulsive way.
With ingenuous frankness he spoke of what a wicked, ill-disciplined boy he had been, and impulsively drew up his cuff to exhibit upon his wrist the scar from a saber cut which he had received in a duel outside of Paris when he was nineteen.
There are no more uses of "impulsive" in the book.
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letting him borrow her car was an impulsive act that she immediately regretted