と思うな

I strongly think that …, Don’t think that …

→ と
phrase Rare #24,755
I strongly think that … Here, sentence-final な adds emphasis. It is not the prohibition meaning “don’t think.”
JA: 今年はライオンズが優勝すると思うな。
EN: I really think the Lions will win the championship this year.

易先生はもっと払うと思うな

I think Mr. Yi will pay more.

— ラスト、コーション (2007)

トムとメアリーが結婚しても、誰も驚かないと思うな。

I don't think anyone would be surprised if Tom and Mary got married.

私の予想だと、すぐに雨が降ると思うな。

I have a feeling it's going to rain soon.

トムはその使い方を知らないと思うな。

I don't think Tom knows how to use it.

正直きみに教師になる素質はないと思うな。

Honestly, I don't think you have what it takes to be a teacher.

今年はライオンズが優勝すると思うな。

I have a feeling the Lions will win the championship this year.

ではお前はこれから後、何になったら好いと思うな

So, what do you think you should become from now on?

phrase Rare #41,884
Don’t think that … A direct, often stern way to tell someone not to believe or assume something.
JA: 俺を簡単に殺せると思うな。
EN: Don’t think you can kill me easily.

俺を簡単に殺せると思うな

Don't think you can kill me so easily.

— レオン (1994)

午後はずっとトムと一緒の部屋だなんて、耐えられないと思うな。

I don’t think I could stand being in the same room as Tom all afternoon.

知りたいと思うな。

Don't think you want to know.

— アトランティス 失われた帝国 (2001)