Insensitive one for example shows no hesitation (4)
I believe the answer is:
numb
'insensitive' is the definition.
(synonyms)
'one for example shows no hesitation' is the wordplay.
I cannot really understand how this works, but
'no' could be 'n' (common abbreviation) and 'n' is found within the answer.
'hesitation' could be 'um' (um is said in hesitation) and 'um' is found 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 "Lacking sensation" , "Insensate" , "Deprived of sensation" , "Unable to move" , "Stinks" .)