一体 => …the heck; …in the world; …on earth N3
も同然 => just like; same as ~ N2
と[共「とも」]に => Both, at the same time N2
Information, Report
と同時に => at the same time as; while; simultaneously ~ N2
~ひょうしに(~拍子に)   => the moment [A], unintentionally / inadvertently caused something to happen N1
~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