This word does not translate well.

Source: Tatoeba

I know staying up overnight is bad for the body.

Source: Tatoeba

Neither Tom nor Mary has a very good memory.

Source: Tatoeba

I like English, but I cannot speak well.

Source: Tatoeba

High calorie foods are bad for my health.

Source: Tatoeba

The lubrication system was poorly designed.

Source: Tatoeba

I'm a foreigner and I don't know Czech very well. Please, speak slowly.

Source: Tatoeba

I still don't write Chinese well.

Source: Tatoeba

I'm always in a bad mood.

Source: Tatoeba

You don't seem scared.

Source: Tatoeba

This table is not good.

Source: Tatoeba

Even though I studied English for 6 years in school, I'm not good at speaking it.

Source: Tatoeba

Because of his age, my grandfather doesn't hear well.

Source: Tatoeba

Is eating cockroaches a bad idea?

Source: Tatoeba

Some passengers complained about the service.

Source: Tatoeba

Don't read under insufficient light, for it is bad for your eyes.

Source: Tatoeba

These shoes are uncomfortable to walk in.

Source: Tatoeba

Tom isn't good at math.

Tom is not good at math.

Tom is bad at math.

Source: Tatoeba

What's wrong with that?

Source: Tatoeba

If the food isn't good, I am very sorry.

Source: Tatoeba

Tom couldn't read very well until he was thirteen years old.

Source: Tatoeba

I am not good at mathematics.

Source: Tatoeba

He wishes to erase bad memories.

Source: Tatoeba

He is terrible at math.

Source: Tatoeba

It's not a good idea to stay up at night for so long.

Source: Tatoeba

Smoking is bad for your health.

Source: Tatoeba

Your sister cannot swim well, can she?

Source: Tatoeba

If you don’t do more exercise, you’ll be unhealthy.

Source: Tatoeba

Hot and humid weather puts me in a bad mood.

Source: Tatoeba

Please excuse my bad French.

Source: Tatoeba