The Collaborative International Dictionary
Insensateness
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.
Wiktionary
insensateness
n. Quality of being insensate.