This is the 12980th most frequent Spanish word.
perniciosas
Harmful or destructive.
The word 'perniciosas' refers to ideas that cause harm or negative impact on personal growth.
Esas ideas son perniciosas para el desarrollo personal.
Those ideas are pernicious for personal development.
Here, 'perniciosa' describes the harmful effects that certain influences can have on society.
La influencia de ciertos grupos puede ser perniciosa para una sociedad progresista.
The influence of certain groups can be pernicious for a progressive society.
In this context, 'pernicioso' highlights the detrimental impact of a habit on one's health.