Canadian scientists have found a worrisome new example of the power that birds have to spread stuff around.
出自-2016年12月听力原文
Despite the success of the experiment, the actual results are worrisome, and mostly confirm earlier studies.
2017年6月六级真题（第一套）阅读 Section A
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
令人担忧的;使人发愁的
Something that is worrisome causes people to worry.
英英词典释义
Adjective
1. not reassuring; tending to cause anxiety
2. causing distress or worry or anxiety;
"distressing (or disturbing) news""lived in heroic if something distressful isolation""a disturbing amount of crime""a revelation that was most perturbing""a new and troubling thought""in a particularly worrisome predicament""a worrying situation""a worrying time"