alarmingdifference

noun
UK /əˈlɑː.mɪŋ ˈdɪf.ər.əns/
US /əˈlɑːr.mɪŋ ˈdɪf.ɚ.əns/

A difference that makes you feel worried or scared.

There was an alarming difference between the two test scores.


OTHER MEANINGS

2. A change that is big enough to cause concern.

The alarming difference in temperature worried the farmers.

3. A gap between things that seems dangerously large.

The alarming difference in wealth split the town in two.

4. A contrast that surprises people in a bad way.

The alarming difference between the twins' behavior shocked their teacher.