A recluse.
Perfidious
Don't call someone
easy going
Someone who never goes to the deep end, cannot perform any type of stroke, and someone who never goes on the diving board.
Someone's age
a diver
Text them, call them, or go to their house.
A free spirit
A tresspasser; the act of tresspasing
Call 9-1-1
Someone you need to tell they need to either need to come or go and stay there!
You can call them. If they answer, the phone is on.