How to Say "hallucinatory" in Spanish
The Spanish word for “hallucinatory” is “alucinante” — B1 level. This is a very common word in everyday Spanish.

Examples
¡Vimos un atardecer alucinante en la playa!
We saw an amazing sunset at the beach!
Es alucinante que ese niño hable cinco idiomas.
It's mind-blowing that that child speaks five languages.
La tecnología de este coche es simplemente alucinante.
The technology in this car is simply incredible.
One word for everyone
This adjective ends in 'e', which means it stays the same whether you are describing a masculine noun (el libro) or a feminine noun (la casa). No need to change the ending!
Using it with 'ser' vs 'estar'
Use 'ser' to describe a quality (The movie is amazing: La película es alucinante). Use 'estar' if you are describing a state or a surprising appearance (You look amazing today: Estás alucinante hoy).
Don't change the 'e' to 'a'
Mistake: “La vista es alucinanta.”
Correction: La vista es alucinante. Adjectives ending in 'e' don't change to match feminine nouns.
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