... Madame bit her lips, for she had thoughtlessly committed herself... 
Alexandre Dumas, Pere 「Ten Years Later」
... Chauvelin during this brief interlude, had walked thoughtlessly on ahead...
Baroness Orczy 「El Dorado」
...I had thoughtlessly repeated some scandalous gossip against the characterof a naphtha launch in the river...
Mary H. Kingsley 「Travels in West Africa」
...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」
...At the sight of a great cricket, which thoughtlessly approaches alongthe wire-work of the cover, the Mantis, shaken by a convulsive start,suddenly assumes a most terrifying posture...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...“Yes,” I replied, thoughtlessly and eagerly...
Various 「Astounding Stories of Super-Science January 1931」
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