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1 completely stupid and without any purpose [= senseless]:
His drinking bouts often ended in acts of mindless violence.
2 if something is mindless, you can do it or watch it without thinking or using your mind:
Doug was watching something mindless on television.
the mindless routine of military discipline

mindless of something

not paying attention to something, especially something dangerous or unpleasant:
After lunch we explored the city, mindless of the rain.
mindlessly adverb

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