っぽい => Seems A; A-ish N3
Adjectival, Description
たぶん => Maybe... N4
Speculation
~んがため(に)/~んがための      => in order to ~ N1
たぶん => perhaps; probably N4
っぽい => seems like; somewhat; -ish; easily does; often does ~ N2
たとたん(に) => as soon as; just as ~ N3
んだった => If... (express regret) N2
Regret
...たいんですが => want N4
How to say the beginning
いっぽう(で) => on one hand, on the other hand; although ~ N2
Compare
いったん~ば/と/たら   => Once you do something N2
Necessity, obligation
ませんでした => Did not... N5
Negation in the past
たとたん => As soon as A (occured), B N3
Time, Situation