1. Relating to: This is the most common meaning. It indicates a connection or relevance to something.
* Example: "I have some concerning news about your car." (The news is related to your car.)
2. Causing worry or anxiety: This meaning implies something is troubling or worrisome.
* Example: "The doctor's report was concerning, but we're hopeful for a positive outcome." (The report caused worry.)
To be extra clear, here are some synonyms:
* Relating to: Regarding, about, pertaining to, with respect to
* Causing worry: Troubling, alarming, unsettling, worrisome
Ultimately, the meaning of "concerning" will depend on the context of the sentence.