1. 不练达的；不谙世故的；不老练的
If you describe someone as unworldly, you mean that they have not experienced many things in their life and do not know what sort of things usually happen to other people during their lives.

2. 淡泊的；恬淡的
If you describe someone as unworldly, you mean that they are not interested in having a lot of money or possessions.