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

Examples
La historia de esa civilización antigua es realmente fascinante.
The history of that ancient civilization is truly fascinating.
Tiene una personalidad tan fascinante que todos quieren hablar con ella.
She has such a charming personality that everyone wants to talk to her.
Vimos un documental fascinante sobre el espacio.
We watched a fascinating documentary about space.
Gender is Easy!
Since 'fascinante' ends in '-e', it is the same whether the thing you are describing is masculine (el libro) or feminine (la historia). Just remember to add an 's' for plural: 'fascinantes'.
Use with SER
This adjective describes an inherent quality, so you will almost always use it with 'ser' (es fascinante), not 'estar'.
Changing the Gender
Mistake: “La película fascinanta.”
Correction: La película fascinante. (Don't try to change the ending to match the feminine 'a'.)
Related Translations
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