Antonym of PRECARIOUS

Precarious : not securely held or in position; dangerously likely to fall or collapse.
Dangerous : able or likely to cause harm or injury.
Safe : protected from or not exposed to danger or risk; not likely to be harmed or lost.
Cautious : (of a person) careful to avoid potential problems or dangers.
Easy : achieved without great effort; presenting few difficulties.

Antonym of Precarious is Safe