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This phrase is incorrect while the others are fine.

Well, it can be interpreted as a part of the phrase «без страха и упрёка» (‘knight without fear or reproach’, ‘chevalier sans peur et sans reproche’).

Yes.


Doesn’t seem so.

Good point! Your caution is appropriate.


But «воля и разум» ‘will and reason’ has nothing in common with ‘fearless’

Maybe, храбрая ‘brave, courageous, valiant’?