退屈 in English:

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.

I'm bored.

Far from being bored, I had a great time.

To tell you the truth, I'm completely bored.

The more she talked, the more bored I got.

There's still a lot left to do, so I won't get bored.

At the beginning, I was bored with radio gymnastics, but now I do not dislike it.

Bored waiting or rushing off at full speed.

Soon Christopher Columbus got bored watching the noob toy getting repeatedly self-pwned; he then decided to make a fortune-teller advise him on what to do with such a pointless toy.

I would be bored if I had to count to five hundred twenty-four thousand three hundred seventy-two.

Imogen of the Internet is fighting six bored housewives to win an eBay auction for a bag of premium chai tea.

Sarah gets very bored listening to her grandparents rambling on about old times.

I visited my friend last week, but she spent all her time on her smartphone. She didn't talk to me so I was really bored.

Intelligent people don’t get bored.

It was a ​cold, ​wet ​day and the ​children were bored.

Ken never gets bored at work because he meets new people every day

It was boredom that Aldous Huxley considered one of the most dangerous human conditions.

In his boredom he thought of this and that.

Disrespect, boredom, too much time on Facebook, having sex with other people.

that is what boredom is all about

I nearly died of boredom.

I need to do something, or the boredom will kill me.

A lot of her unhappiness is due to boredom.

But summer boredom was nothing like the school boredom that always started by the end of the second

Boredom is the feeling that everything is a waste of time; serenity, that nothing is.

I am no match for boredom.

I distracted myself from the boredom of my long journey by reading mysteries.