1) Brutal 2) Cold 3) Cruel 4) Foolish 5) Insentient 6) Not endowed with sensation 7) Unfeeling 8) Wanting sensibility 1) Inhuman 2) Inhumane 3) Insentient 4) Numb 
• (a.) Wanting sensibility; destitute of sense; stupid; foolish.
In·sen'sate adjective [ Latin insensatus . See In- not, and Sensate .] Wanting sensibility; destitute of sense; stupid; foolish. « The silence and the calm Of mute, insensate things.» Wordsworth. « The meddling folly or insensate ambition...
insensate Lacking sensation or feeling; not feeling, or not capable of feeling; without sense or reason.
not endowed with sensation; inanimate: insensate stone. · without human feeling or sensitivity; cold; cruel; brutal. · without sense, understanding, or judgment; foolish.
devoid of feeling and consciousness and animation[Intelligent words] devoid of feeling and consciousness and animation