Cast adrift

What does "cast adrift" mean, in terms of "somebody cast adrift into the world of mysticism". I've been checking out the definitions of "cast" some are okay, some don't work at all, and I was wondering if there was something better.

It's a nautical thing. Cast as in cause to move forward by tossing or throwing.

Boatsafe.com says "cast off" is - To let go.

Adrift (Merriam-Webster):

Main Entry: adrift
Pronunciation: &-'drift
Function: adverb or adjective
1 : without motive power and without anchor or mooring
2 : without ties, guidance, or security
3 : free from restraint or support

I live on an island, a big and long island.
Seems everyone but I has a boat.

If you are on a boat and you are "cast adrift" you are usually without an anchor and you are in a lot of trouble because the wind and weather will give you a mighty beating.

What a sweet picture. I think. How will they ever get ashore?