If a boat is adrift, it is floating on the water and is not tied to anything or controlled by anyone.
They were spotted after three hours adrift in a dinghy.
他们在一艘小艇里漂浮了3个小时才被发现。
If someone is adrift, they feel alone with no clear idea of what they should do.
Amy had the growing sense that she was adrift and isolated.
埃米有越来越强的茫然与孤独感。