たぶん => Maybe... N4
Speculation
ぶり => style; manner; way​ N1
たぶん => perhaps; probably N4
がないでもない => is not entirely impossible N2
Explain
いちがいに…ない => Impossible... in general N2
Description
て仕方がない/てしょうがない => can't help but; very; extremely ~ N2
…どうりがない => No reason... N2
Emphasize negative meaning
… とはいいながら => although, even though... N2
Invariant
~ぶんには => If it's just within range...then N1
Scope
~ぶんには(~分には) => as long as ~ N1
じゃないが => It's not that... but... N4
How to say the beginning
いまさらながら => Still ... now N3
Time