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
   - unmindful, forgetful 
4. Showing a lack of intelligence or thought; stupid and silly
   - asinine, fatuous, inane, vacuous 
5. Not marked by the use of reason
   "mindless violence"
   - reasonless, senseless

See also: amnesiac, amnesic, foolish, heedfulness, meaningless, mindfulness, mindlessly, mindlessness, nonintellectual, nonmeaningful, unreasonable

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