"senseless" in the adjective sense
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
Source: WordNet® (An amazing lexical database of English)
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