This is the 5296th most frequent Russian word.
опасным
Dangerous.
Here, 'опасным' describes a potential risk or harm associated with the action.
Переходить дорогу в неположенном месте может быть опасным.
Crossing the road in an undesignated area can be dangerous.
In this case, 'опасным' depicts a characteristic or trait of a subject.
Этот хищник считается очень опасным для людей.
This predator is considered very dangerous for humans.
'Опасным' here again relates to the consequences or risks of neglecting proper care.