- It’s fascinating.
- It’s intriguing.
- I couldn’t tear myself away.
- I couldn’t put it down.
(this phrase is used for en extremely interesting book) - I was so into it, I lost track of time.
- It does nothing for me.
- I was bored to tears.
- I was bored to death.
- I was dying of boredom.
- It’s about as exciting as watching paint dry.
(= it’s very boring)
