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

Examples

• The silence was disquietingly long after she asked the question.
• His behavior has become disquietingly erratic over the past month.
• The report's findings were disquietingly similar to predictions made years ago.
• She spoke in a disquietingly calm voice despite the emergency.
• The number of missing persons in the area has grown disquietingly fast.
• The old house creaked disquietingly as we walked through the hallway.