More insensitive cardinal? (6)
I believe the answer is:
number
I believe this clue is a double definition.
'more insensitive' is the first definition.
('numb' can be a synonym of 'insensitive')
'cardinal?' is the second definition.
(cardinal is a kind of number)
(Other definitions for number that I've seen before include "Cardinal or ordinal" , "Count - a digit?" , "1,2,3, for instance" , "issue of magazine" , "Symbol indicating how many" .)