worrying

adjective

wor·​ry·​ing ˈwər-ē-iŋ 

ˈwə-rē-

: causing worry : creating reason for worry : troubling

a worrying trend/development

a worrying question

The presence of the knife on the stage of the murder was a worrying circumstance for Wilson.

—Mark Twain

worryingly adverb

When the secretary returned, she handed us an envelope that looked worryingly official …

—Caroline Alexander

… money held by households has risen at a worryingly slow rate over the past year …

—The Economist

Word History

First Known Use

1817, in the meaning defined above