How to Say "pretentiousness" in Spanish
The Spanish word for “pretentiousness” is “pretensión” — B2 level.

Examples
Es una película sencilla, sin pretensiones.
It's a simple movie, without any pretentiousness.
No soporto su pretensión de saberlo todo.
I can't stand his pretension of knowing everything.
El restaurante tiene mucha pretensión pero la comida es mediocre.
The restaurant is very pretentious (has a lot of pretension) but the food is mediocre.
Using 'Sin'
The phrase 'sin pretensiones' is a very common fixed expression used to describe things that are humble, honest, or simple.
Pretensión vs. Pretexto
Mistake: “Usó una pretensión para irse.”
Correction: If you mean an 'excuse,' use 'pretexto.' 'Pretensión' refers to a goal or a fancy attitude, not a lie to get out of something.
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