causing alarm or fear: an alarming case of pneumonia; an alarming lack of respect.

Origin of alarming

First recorded in 1670–80; alarm + -ing2
Related formsa·larm·ing·ly, adverbun·a·larm·ing, adjectiveun·a·larm·ing·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for alarmingly

Contemporary Examples of alarmingly

Historical Examples of alarmingly

Word Origin and History for alarmingly

1787, from alarming, present participle adjective from alarm (v.), + -ly (2).

Online Etymology Dictionary, © 2010 Douglas Harper