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Adjective: mindless  mInd-lus
  1. Lacking the thinking capacity characteristic of a conscious being
    "the shrieking of the mindless wind"
  2. Requiring little mental effort
    "mindless tasks"
  3. Not mindful or attentive
    "while thus mindless of his steps he stumbled";
    - unmindful, forgetful
  4. Showing a lack of intelligence or thought; stupid and silly
    "It was in this last category that the mindless comments began";
    - asinine, fatuous, inane, vacuous
  5. Not marked by the use of reason
    "mindless violence";
    - reasonless, senseless

See also: amnesiac, amnesic, daft, dumb, foolish, heedfulness, meaningless, mindfulness, nonintellectual, nonmeaningful, stupid, unintellectual, unreasonable