'Tokyo's subway is packed at rush-hour.'
Oversuing the word 'very' when talking can be boring for the person listening. For example:
"Yesterday, It was very hot, so I went to the park, but it was very crowded. There was a very big dog in the park and I was very scared when it ran by me. I started to feel very hungry so I decided to buy an ice-cream. The ice-cream I bought was very cold, but it tasted very bad. I think it was old. I tried to complain but the seller didn't care. I was very angry! Unfortunately, I was very tired and I didn't feel like arguing. On the way home I stopped in a cafe and drank a cold glass of lemonade. It was very good!"
Instead of using 'very' too much we can use 'extreme adjectives'.
These adjectives mean very + adjective. As extreme adjectives have a strong enough meaning, you do not need to use 'very'. If you want to make them stronger, you can use 'absolutely' before the extreme adjective.
Here's a table of some extreme adjectives and what they mean: