1. to make someone feel anxious, worried, or uncomfortable
2. to disrupt or make unstable

Examples

• The strange noise in the attic unsettled her.
• News of the layoffs unsettled the entire workforce.
• The earthquake unsettled the foundation of the building.
• His odd behavior began to unsettle his friends.
• The political crisis unsettled the stock market.
• The ghost stories unsettled the children at bedtime.
• Moving to a new country can unsettle even the most confident person.