A person believes their abilities are set and cannot improve, which stops them from trying new things. What kind of mindset do they have?

The person has a fixed mindset. A fixed mindset is the belief that one's basic abilities, intelligence, and talents are static, predetermined traits. Individuals with this mindset believe these qualities are "set" and cannot be significantly developed or improved through effort. Consequently, they avoid trying new things and challenges because they view effort as futile if their abilities are unchangeable. Failure is seen as a direct reflection of their inherent, unalterable lack of ability, rather than an opportunity for learning or growth. Their reluctance to engage in new activities stems from the conviction that their capacity to learn or succeed in those areas is fixed, making any attempt pointless.