Very dry and, most of all, unfeeling (6)
I believe the answer is:
brutal
'unfeeling' is the definition.
(thesaurus)
'very dry and most of all' is the wordplay.
'very dry' becomes 'brut' (term for very dry wine).
'and' says to put letters next to each other.
'most of' means to remove the last letter.
'all' with its final letter taken off is 'al'.
'brut'+'al'='BRUTAL'
(Other definitions for brutal that I've seen before include "Inhuman - pitiless" , "Harsh, merciless" , "Very cruel and beastly" , "Cruel, in animal fashion" , "cruelly savage" .)