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thought·less / ˈ[unvoicedth]ôtləs/ • adj. (of a person or their behavior) not showing consideration for the needs of other people: it was thoughtless of her to have rushed out and not said where she would be going. ∎  without consideration of the possible consequences: to think a few minutes of thoughtless pleasure could end in this.DERIVATIVES: thought·less·ly adv.thought·less·ness n.