How to Say "disastrous" in Spanish
The most common Spanish word for “disastrous” is “fatal” — use 'fatal' when referring to an outcome that is extremely bad, terrible, or even deadly, often implying a permanent or irreversible negative consequence..
fatal
fah-TAHL/faˈtal/

Examples
La comida en ese restaurante era fatal, no pudimos terminarla.
The food at that restaurant was terrible; we couldn't finish it.
Mi entrevista de trabajo fue fatal. No creo que me llamen.
My job interview went terribly (was awful). I don't think they'll call me.
Always the Same Form
Unlike most Spanish adjectives, 'fatal' does not change its ending to match the noun's gender (masculine or feminine) or number (singular or plural). It always stays 'fatal'.
Overusing -mente
Mistake: “Hablamos fatalmente de la película.”
Correction: Hablamos fatal de la película. ('Fatal' can act as an adverb without the '-mente' ending.)
trágico
Examples
Fue un accidente trágico; muchas familias perdieron a sus seres queridos.
It was a tragic accident; many families lost their loved ones.
Fatal vs. Trágico
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