... “I know a means of procuring them,” said the duchesse, thoughtlessly... 
Alexandre Dumas, Pere 「Louise de la Valliere」
...Such lovely holes,so plentiful, so worse than useless where the Badgerhas thoughtlessly located them...
Ernest Thompson Seton 「Wild Animals at Home」
...If you should ever consider yourself forced to employ a spikedcollar, do not thoughtlessly imagine that the same collar will suit alldogs...
Dinks, Mayhew, and Hutchinson 「The Dog」
...And so, with the thoughtlessly cruelcunning of a schoolboy, he had devised a means of improving upon this...
A. J. Dawson 「Finn The Wolfhound」
...When the spoiler makes her rush, it is usually at a Bee who meets her half-way, and, so to speak, flings herself into her clutches, either thoughtlessly or out of curiosity...
J. Henri Fabre 「More Hunting Wasps」
...“Yes,” I replied, thoughtlessly and eagerly...
Various 「Astounding Stories of Super-Science January 1931」
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