そう思いません

I don't think so

→ そう
phrase Rare #31,313
I don't think so そう思いませんか means “don't you think so?” and is used to ask for agreement. Without か, it is a polite way to disagree or express that you do not share an opinion.
JA: 私はその方法が一番いいとはそう思いません。
EN: I don't think that method is the best.

そう思いません

Don't you think so?

そう思いません

I don't think so.

自分はそう思いません

I don't think so.

そう思いません

Don't you think so?

— さらば、わが愛/覇王別姫 (1993)

いいえ、私はそう思いません

No, I don't think so.