worrisome
adj. B2 Upper Intermediate US //ˈwɝisəm// UK //wˈʌɹisˌʌm// wor·ri·some
adj. causing worry or concern. You use this to describe a situation or a problem that makes you feel uneasy or nervous.
adj. causing anxiety or concern; tending to provoke worry. Often used to describe trends, behaviors, or developments that suggest a potential negative outcome.
The sudden drop in sales is a worrisome sign.
The doctor noted that the patient's high blood pressure was a worrisome development that required immediate attention.
While the initial results were promising, the researchers remained cautious, as the worrisome side effects observed in the trial suggested a need for further long-term study.
From worry + -some.