Not showing care or consideration for other people's feelings; done without thinking about the consequences.
Formed from 'thought' (from Old English 'þoht,' meaning 'idea') plus the suffix '-less' (meaning 'without'), creating a word meaning 'without thought.'
Interestingly, being 'thoughtless' doesn't mean you lack the ability to think—it means you didn't bother using that ability, which is why it's often considered worse than just being mistaken.
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