0 dangerously, or in a way that can cause problems:
They passed a house which seemed to hang perilously onto the hillside.
The oil price is hovering perilously close to $100 a barrel.
He was driving in perilously wet conditions for the first time.
However, to have an authority figure require that a patient justify his or her plans comes perilously close to coercion.
If in addition to it not being removed, village livestock grazing is not restricted, the number of tigers could fall to perilously low levels.
In cultural terms, being unmarked may even seem perilously close to not being at all.
This collection should add to the former, but it comes perilously close to qualifying for the latter as well.
Age-resistance is something that comes perilously near age-denial.