Fanatismo (en. Fanaticism)

/fa.na.tis.mo/

Slang Meanings

Extreme use of passions or beliefs.
Don't be so fanatical, we need to understand others.
No seas tan fanático, hay que entender a los demás.
In an irrational or blind manner.
That guy is a fanatic; he doesn't listen to other opinions.
Ese tipo es un fanático; no escucha otras opiniones.