I have an idea.

I have no idea what you're talking about.

I have no idea what you're talking about.

I realized that my preconceived idea about him was completely wrong.

Why are you asking me that? What's the big idea?

This is an ideal job for me.

Ideally, I would like to travel the world.

She approached the problem idealistically, believing that a perfect solution could be found.

I idealize the perfect life of living on a remote tropical island.

Many people tend to idealize their romantic partners.