1. (

• mindless ,
• reasonless ,
• senseless

) not marked by the use of reason; "mindless violence"; "reasonless hostility"; "a senseless act" ;

2. (

• insensible ,
• senseless ,
• out_of_it

) unresponsive to stimulation; "he lay insensible where he had fallen"; "drugged and senseless" ;

3. (

• otiose ,
• pointless ,
• purposeless ,
• senseless ,
• superfluous ,
• wasted

) serving no useful purpose; having no excuse for being; "otiose lines in a play"; "advice is wasted words"; "a pointless remark"; "a life essentially purposeless"; "senseless violence" ;

4. (

• nitwitted ,
• senseless ,
• soft-witted ,
• witless

) (of especially persons) lacking sense or understanding or judgment ;