～も同然だ (〜mo douzen da)
Explanation
Indicates 'as good as', 'virtually', or 'practically' the same as something.
Formation
Noun + (も)同然だ, Verb-casual + (も)同然だ, etc.
Detailed Explanation
「～も同然だ」 means something is practically the same as (X). It emphasizes that although it may not be literally identical, there is hardly any difference in reality.
Examples
彼とは長い付き合いだから、家族も同然だ。
Kare to wa nagai tsukiai dakara, kazoku mo douzen da.
I've known him for so long that he's practically family.
毎日遅刻するなんて、来ていないも同然だ。
Mainichi chikoku suru nante, kite inai mo douzen da.
Being late every single day is as good as not coming at all.
彼女と私は幼なじみで、姉妹も同然の仲です。
Kanojo to watashi wa osananajimi de, shimai mo douzen no naka desu.
She and I are childhood friends, practically like sisters.
こんなに少ない給料じゃ、ただ働きも同然だ。
Konna ni sukunai kyuuryou ja, tadabataraki mo douzen da.
With such a small salary, it's practically like working for free.
Grammar content sourced from hanabira.org.