incautiously

varomattomasti In an incautious manner; with a lack of caution.
1813, (w), (w), Volume II, Chapter 13,http://www.gutenberg.org/files/42671/42671-h/42671-h.htm

His behaviour to herself could now have had no tolerable motive; he had either been deceived with regard to her fortune, or had been gratifying his vanity by encouraging the preference which she believed she had most incautiously shewn.

(..) the piranhas habitually attack things much larger than themselves. They will snap a finger off a hand incautiously trailed in the water (..)

The parson explained that the dissenters were insufficiently grounded in religious learning, inappropriately eager to administer the sacraments without his help or sanction, and incautiously emotional in their worship.