The word "unsettling" means something that disturbs or disrupts a sense of peace, security, stability, or normality. It can refer to an event, situation, or emotion that makes someone feel uneasy, anxious, or uncertain about their surroundings, circumstances, or well-being. The term is often used to describe something that creates a feeling of discomfort, fear, or apprehension in people, such as unsettling news, an unsettling atmosphere, or an unsettling experience.