mindless

lacking the thinking capacity characteristic of a conscious being

• “the shrieking of the mindless wind”

requiring little mental effort

• “mindless tasks”

not mindful or attentive

• “while thus unmindful of his steps he stumbled” G.B.Shaw

complacently or inanely foolish

not marked by the use of reason

• “mindless violence”
• “reasonless hostility”
• “a senseless act”