卑劣なやり方だよな。の英語

What a mean attitude!

What a mean fellow!

It's a dirty trick.

That's a dirty trick.

How persistent you are!

Away with such a servile spirit!

You always try to get what you want.

It is a wild scheme―a mad scheme.

It is cursed conduct on his part.

It is a clumsy piece of work―sorry stuff―wretched stuff.

That's not the way you're supposed to do it.

That's not the proper [approved] way of doing it.

Truly, you are a person who will not learn from experience.

Truly, you do not learn from experience.

Truly, you never learn from experience.

Truly, you never learn.

That's absurd.

That's crazy.

That's impossible.

It is like looking for a needle in a haystack.

You always try to get what you want.

How foolish!

What a haughty fellow he is!

That looks somewhat dangerous.

Do not say such foolish things.

Don't say such foolish things.

It is a lame excuse.

Stop acting like such a fool.

It is a poor excuse―a lame excuse.

Don't be a fool.