Undutiful is a really clumsy word to my ears. Dishonourable would seem to fit better in this context.
My computer underlines 'undutiful' in red.
Would using insubordinate here be too specific?
Undutiful doesn't seem like a good translation word choice... maybe disobedient?
Impious comes into English as unpious, or unfaithful to ones duties, so undutiful is accurate.
is there such a word as undutiful?
did not accept "unpatriotic" ???