Meaning : Not marked by the use of reason.
Example :
Mindless violence.
Reasonless hostility.
A senseless act.
Synonyms : mindless, reasonless
Meaning : Unresponsive to stimulation.
Example :
He lay insensible where he had fallen.
Drugged and senseless.
Synonyms : insensible, out of it
Meaning : Serving no useful purpose. Having no excuse for being.
Example :
Otiose lines in a play.
Advice is wasted words.
A pointless remark.
A life essentially purposeless.
Senseless violence.
Synonyms : otiose, pointless, purposeless, superfluous, wasted
Meaning : (of especially persons) lacking sense or understanding or judgment.
Synonyms : nitwitted, soft-witted, witless