Sky-high (adjective)

1. Very high.
2. Exorbitant.

Origin:

1840-50; from the phrase sky-high, meaning very high in the sky.

Examples:

1. The prices for the concert tickets were sky-high.
2. The skyscraper reached sky-high heights.
3. The stock market is sky-high today.
4. The sky-high heels made her tower over everyone else.
5. The cost of living in this city is sky-high.