Extravagant (adjective)

1. Spending much more money than is necessary or wise; characterized by or involving excessive or uncontrolled expenditure.
2. Going beyond what is reasonable or appropriate; exceeding the limits of good taste or propriety.
3. Exceeding what is ordinary or usual in size, amount, or degree; exceptional.

Origin:

Late 16th century: from latin extravagans, extravagant- "wandering outside", from extra- "beyond" + vagari "wander".

Examples:

1. The extravagant wedding cost a fortune.
2. The extravagant lifestyle of the rich and famous often involves waste and excess.
3. The extravagant decorations on the cake were impressive but over-the-top.
4. The extravagant claims made by the company were not supported by evidence.
5. The extravagant cost of the holiday was due to the luxurious hotels and activities.