Pronounce 'unmitigated' (5)
I believe the answer is:
utter
This clue is a double definition.
'pronounce' is the first definition.
(thesaurus)
'unmitigated' is the second definition.
('utter' can be similar in meaning to 'unmitigated')
(Other definitions for utter that I've seen before include "Pure" , "To say, articulate" , "Speak in absolute way" , "Put into words" , "Without a single qualification" .)