Insensitive note carefully hiding doubtful statement (4)
I believe the answer is:
numb
'insensitive' is the definition.
(synonyms)
'note carefully hiding doubtful statement' is the wordplay.
I cannot quite see how this works, but
'note' could be 'n' (abbreviation) and 'n' is found within the answer.
'doubtful' could be 'um' (saying 'um' communicates doubt) and 'um' is located in the answer.
A single letter 'b' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for numb that I've seen before include "Stupefied; unfeeling" , "Feeling nothing" , "Dead" , "Deadened, desensitised" , "Lacking feeling" .)