Open English Wordnet
Adjectives
(s)mindless, reasonless, senselessnot marked by the use of reason“mindless violence”, “reasonless hostility”, “a senseless act”
(s)insensible, senseless, out of itunresponsive to stimulation“he lay insensible where he had fallen”, “drugged and senseless”
(s)otiose, pointless, purposeless, senseless, superfluous, wastedserving 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”
(s)nitwitted, senseless, soft-witted, witless(of especially persons) lacking sense or understanding or judgment