Source : Webster's Revised Unabridged Dictionary (1913)

Insensate \In*sen"sate\, a. [L. 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 of statesmen.
                                                  --Buckle.
   -- {In*sen"sate*ly}, adv. -- {In*sen"sate*ness}, n.

Source : WordNet®

insensate
     adj 1: devoid of feeling and consciousness and animation;
            "insentient (or insensate) stone" [syn: {insentient}]
            [ant: {sentient}]
     2: without compunction or human feeling; "in cold blood";
        "cold-blooded killing"; "insensate destruction" [syn: {cold},
         {cold-blooded}, {inhuman}]