Completely but contrarily in the wrong (8)
I believe the answer is:
outright
'completely' is the definition.
(outright means completely or totally)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for outright that I've seen before include "Total" , "Completely - immediately" , "Completely and openly - say a win" , "Without reservation or exception" , "Without qualification" .)