troubling

Troubling means causing worry or concern about something that might happen.

When people use the word "troubling", they usually talk about issues or problems that are giving them sleepless nights. For example, they might say a situation at work is troubling because it's not resolved yet and could lead to more trouble later on. In some cases, they might describe someone who's been acting strangely as troubling - their behavior is making others uneasy. The word can also be used to describe news or information that's causing concern about the future, like economic troubles in a country or environmental issues affecting wildlife.