Usage examples for thoughtless
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You are not a thoughtless child. – Out of the Primitive by Robert Ames Bennet
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And he may recall how frightened he was when some foolishly thoughtless friend or heartless bully tried to duck him, or to push him beyond his depth. – Healthful Sports for Boys by Alfred Rochefort
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How thoughtless, how cruel of me! – The Black Robe by Wilkie Collins