Worrisome means causing worry or concern. When something is worrisome, it makes you feel uneasy or anxious because it might lead to problems. A worrisome cough that lasts for weeks might prompt your parents to schedule a doctor's appointment. A worrisome drop in your math grades signals that you might need extra help or a different study approach.

The word describes situations, signs, or patterns that deserve attention. A few worrisome cracks in a building's foundation concern engineers because they could mean structural problems. A worrisome change in your friend's behavior, like suddenly becoming quiet and withdrawn, might mean something's bothering them.

Notice that worrisome sits between “concerning” and “alarming.” A single bee near your picnic isn't worrisome, but a swarm heading your way is. Not every problem is worrisome: a scraped knee heals quickly, but a cut that won't stop bleeding is worrisome.

When you call something worrisome, you're saying it's worth paying attention to and possibly doing something about. The word helps us identify when casual observation should shift to careful attention.