What is the meaning of Perilous?

Dangerous, full of peril.

Full of danger or peril; dangerous, harmful, periculous:

1. Fatal, mortal; potentially resulting in death.
2. Scary, frightening; inducing horror and psychological damage.
3. Religiously harmful or hurtful
4. Unfortunate; experiencing bad luck.

Fatal, mortal; potentially resulting in death.

Scary, frightening; inducing horror and psychological damage.

Religiously harmful or hurtful

Unfortunate; experiencing bad luck.

Source: wiktionary.org