insensate \in-SEN-sayt; -sit\ (adjective) - 1 : Lacking sensation or awareness; inanimate. 2 : Lacking human feeling or sensitivity; brutal; cruel. 3 : Lacking sense; stupid; foolish.
"Just now, I couldn't keep back the insensate words -- insensate because useless -- but I judged myself all the time as distinctly as I do now it's over." -- George Gissing, 'The Emancipated'
Insensate comes from Late Latin insensatus, from in-, "not" + sensatus, "gifted with sense, intelligent," from Latin sensus, "sense."