つまらない v angličtině:

I used to use Twitter, but then found it a bit boring, so I stopped using it.

I told you the concert was going to be boring. Why didn't you believe me?

People often lie about what they did on the weekend, so their friends won't realize how boring they really are.

If it were not for books, life would be boring.

She found the evening boring and uninteresting, in short, a waste of time.

How boring.

Frustrated with the European languages, which he considered "too boring", Christopher Columbus invented "Columbian", a language so complicated that only he could speak it.

He greeted the man, and came back home, to his normal, boring routine.

You're the last person in the world I would like to see cloned; you're boring enough on your own.

As for physical exercise, although I loathe most sports (I think they're really boring), I do like going to the gym to lift weights.

The work required to investigate that is boring and wearisome.

The emotion they gave me was exquisite, but I could not preserve it, nor could I indefinitely repeat it; the most beautiful things in the world finished by boring me.

At the last office I went to I ran out of work after a couple of hours, which made the rest of the day rather boring.

All of Steve's jobs were boring or not well-paid or both.

She's so boring, don't invite her to the party.