The Collaborative International Dictionary of English v.0.48:

Insensate \In*sen"sate\, a. [L. insensatus. See In- not, and
   Sensate.]
   Wanting sensibility; destitute of sense; stupid; foolish.
   [1913 Webster]

         The silence and the calm
         Of mute, insensate things.               --Wordsworth.
   [1913 Webster]

         The meddling folly or insensate ambition of statesmen.
                                                  --Buckle.
   -- In*sen"sate*ly, adv. -- In*sen"sate*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

insensately
    adv 1: in an insensate manner