How to Say "instantaneous" in Spanish
The Spanish word for “instantaneous” is “instantáneo” — A2 level. This is a very common word in everyday Spanish.

Examples
El café instantáneo es muy práctico para las mañanas con prisa.
Instant coffee is very practical for busy mornings.
Recibí una respuesta instantánea a mi correo electrónico.
I received an instantaneous reply to my email.
El efecto de la medicina no siempre es instantáneo.
The effect of the medicine isn't always immediate.
Matching Gender and Number
This word must change its ending to match what it describes. Use 'instantáneo' for masculine things (el café) and 'instantánea' for feminine things (la respuesta).
Where to put it
In Spanish, this adjective almost always comes after the thing it describes, like 'un mensaje instantáneo' rather than 'an instant message'.
Using it as a noun
Mistake: “Me gusta el instantáneo.”
Correction: Me gusta el café instantáneo.
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