This is the 14492nd most frequent Russian word.
пагубного
"Destructive" or "harmful."
The word "пагубного" is used here as an adjective describing the negative effect of the influence.
Он избегает пагубного влияния своих друзей.
He avoids the detrimental influence of his friends.
"Пагубного" describes the harmful nature of behavior, used metaphorically to indicate a quality that should be removed.
Исключение пагубного поведения из общества — сложная задача.
Eliminating harmful behavior from society is a challenging task.
"Пагубного" characterizes the outcome or consequence that could be detrimental.