This is the 12671st most frequent Spanish word.
nefastas
Harmful or disastrous.
Here, "nefastas" is used as an adjective to describe the negative and harmful impact of the consequences on the company.
Las consecuencias de las decisiones fueron nefastas para la empresa.
The consequences of the decisions were disastrous for the company.
In this case, "nefastas" characterizes attitudes as harmful or counterproductive in the context of dealing with a crisis.
En momentos de crisis, es importante evitar actitudes nefastas que empeoren la situación.
During crises, it's important to avoid adverse attitudes that worsen the situation.
Here, "nefastas" conveys a very negative and damaging evaluation of the movie within the context of reviews.