Resolute, unwavering (9)
I believe the answer is:
steadfast
I believe this is a double definition.
'resolute' is the first definition.
(similar in meaning)
'unwavering' is the second definition.
(I know that unwavering can be written as steadfast)
(Other definitions for steadfast that I've seen before include "Firm and unwavering" , "Sure" , "Firm and dependable" , "Dedicated" , "Constant, not changing or yielding" .)