も同然だ

is as good as

→ も
phrase Uncommon #8,240
is as good as Used to say that something is effectively equivalent to something else, even if it is not literally the same.
JA: この雨では、試合は中止も同然だ。
EN: With this rain, the game is as good as canceled.

あいつは盗人も同然だ。

That guy is as good as a thief.

仕事は終わったも同然だよ。

The job is as good as done.

彼は私が嘘つきだと言ったも同然だ。

He might as well have called me a liar.

私達は破産したも同然だ。

We’re as good as bankrupt.

彼女の助言は命令も同然だ。

Her advice is as good as an order.

私達は兄弟も同然だ。

We're practically brothers.

彼は自殺したも同然だ

He might as well have committed suicide.

— さらば、わが愛/覇王別姫 (1993)

私は乞食も同然だ。

I'm no better than a beggar.

彼は、人殺しも同然だ。

He's as good as a murderer.

彼はあなたが馬鹿だと言ったも同然だ。

It was basically the same as him calling you an idiot.

彼は泥棒も同然だ。

He is as good as a thief.

これは死骸も同然だ

This is as good as a corpse.

— 生きる (1952)

彼は馬鹿も同然だ。

He is practically an idiot.

彼は天才も同然だ。

He's practically a genius.

その仕事はほとんど終わったも同然だ。

That job is as good as finished.

彼の返答は拒絶も同然だ。

His response was tantamount to a rejection.

水中では、体重なんてないも同然だ。

Underwater, you’re practically weightless.