none. They are safe.
The opposite of implode is explode.
The opposite of definite is indefinite.
The opposite of known is unknown.
The opposite of capacity is empty
The opposite of drive safe is careless driving.
The antonym for safe is dangerous.
The opposite of 'OFF' is 'ON' - -have you never seen those words on each side of a switch
For persons, the opposite is "loyal." For a situation (perilous), the opposite would be safe or unthreatening.
safe
Safe, or secure.
To endanger
The best candidate for that would be safe.
of is a preposition. off is the opposite of on.
I suppose the opposite would be a healthy and safe animal. If it has to be one word, perhaps "healthy."
SAFE
Yes, I think that on and off are opposites.