senseless

not marked by the use of reason

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

unresponsive to stimulation

• “he lay insensible where he had fallen”
• “drugged and senseless”

lacking import

• “a pointless remark”
• “a life essentially purposeless”
• “senseless violence”

(of especially persons) lacking sense or understanding or judgment