否定形 => Negative form N5
Conjugate verbs
予定だ => plan to, intend to N4
一体 => …the heck; …in the world; …on earth N3
も同然 => just like; same as ~ N2
と同時に => at the same time as; while; simultaneously ~ N2
~もどうぜんだ(~も同然だ)      => just like; same as ~ N1
も[同然「どうぜん」]だ => The same as saying A, as good as A N2
Adjectival, Descriptions