~いざ~となると / いざ~となれば / いざ~となったら => When it comes to; in such a case; if that happens N1
Evaluate
まんざらでもない => not so bad... N3
Evaluate
ござる/ございます => Have~ N4
Honorifics
まんざら…でもない/ではない => (not) altogether; (not) wholly N3
Evaluate
でござる/でございます => By, with… N4
Honorifics
~ならいざしらず      => I don't know about … but; it may be possible for … but ~ ... N1
でございます => to be (honorific) N4
でございます => to be (honorific) N4
Respectful, humble
げんざい => now, current, present, present time N3
Time
いざしらず => I don't know about … but; it may be possible for … but ~ ... N3
Innocent
べからざる => Cannot A N1
Potential, Possibility
~べからざる => must not; should not; do not ~ N1
Confirm