Saying "I'm not sure" instead of "I don't know" can be influenced by various factors, including communication style, social norms, and individual personality traits. Here are some reasons why people might prefer using "I'm not sure":
Softening the response: Saying "I'm not sure" can be a more gentle or polite way of expressing uncertainty or lack of knowledge. It may feel less direct or assertive, making it a preferred choice in certain social situations.
Avoiding confrontation: Some individuals may use this phrase to avoid potential conflicts or disagreements. By expressing uncertainty rather than outright saying "I don't know," they may reduce the chances of being challenged or questioned further.
Preserving self-image: Saying "I don't know" could be perceived as admitting a lack of knowledge or expertise, which may affect one's self-image. Saying "I'm not sure" might be a way to protect their sense of competency or knowledgeability.
Buying time: Using "I'm not sure" can buy some time to think or gather thoughts before giving a more definite answer. It allows them to consider the question or topic before committing to an answer.
Social conditioning: Different cultures and social groups may have varying norms and expectations for communication. In some environments, using "I'm not sure" might be more common or encouraged than saying "I don't know."
Habitual language use: Sometimes, individuals may simply have developed the habit of using one phrase over the other without a specific underlying reason.
It's essential to recognize that these are general tendencies and that individual motivations for using one phrase over the other may vary. Some people might not give much thought to the choice of words and use the phrases interchangeably. Ultimately, the intent behind both phrases is the same—to convey uncertainty or lack of knowledge.