How to Say "extravagant" in Spanish
The Spanish word for “extravagant” is “peregrino” — C1 level.

Examples
Esa es una idea un poco peregrina, ¿no crees?
That is a bit of a strange idea, don't you think?
Me dio una excusa peregrina para no venir a la fiesta.
He gave me a far-fetched excuse for not coming to the party.
El autor utiliza un lenguaje peregrino y lleno de arcaísmos.
The author uses a rare language full of archaisms.
Adjective Placement
When using this to mean 'strange,' it almost always comes after the thing it describes (e.g., 'teoría peregrina').
Matching the Noun
Remember to match the ending to the thing you are describing. 'Ideas' is feminine/plural, so you must say 'ideas peregrinas'.
Using it for 'scary' strange
Mistake: “Vi un hombre peregrino en el callejón.”
Correction: Vi un hombre extraño/raro. 'Peregrino' as an adjective usually describes ideas, theories, or excuses, not creepy people.
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