Not very perceptive or sensitive (6)
I believe the answer is:
obtuse
'not very perceptive or sensitive' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for obtuse that I've seen before include "Can't quite see the angle" , "Blunt - stupid - insensitive" , "Annoyingly slow to understand" , "Angles could be" , "Angle greater than 90 degrees" .)