1. in a manner that causes worry, anxiety, or unease; disturbingly

Examples

• The test results were perturbingly similar to last year's, suggesting no improvement.
• She spoke perturbingly slowly, which made everyone in the room uncomfortable.
• The data showed a perturbingly high rate of student absenteeism.
• His behavior has been perturbingly erratic over the past few weeks.
• The silence was perturbingly long after the announcement.
• The report revealed perturbingly low levels of food safety compliance.