Which adult personality trait is described by the tendency to experience negative emotions, such as anger, anxiety, or depression; and is sometimes called 'emotional instability'?

Conscientiousness refers to the degree of organization, dependability, and discipline in an individual. It encompasses traits such as being responsible, careful, and diligent. While conscientious people may manage stress effectively, this trait does not relate to the experience of negative emotions or emotional instability.

Openness involves the willingness to engage with new experiences, ideas, and creative pursuits. It is characterized by curiosity and a broad range of interests. Although individuals high in openness may experience varied emotions, this trait does not specifically denote a tendency toward negative emotional states.

Extraversion is characterized by sociability, enthusiasm, and assertiveness. Extraverts typically enjoy social interactions and are often seen as energetic. This trait is generally associated with positive emotions rather than the experience of negative feelings, making it the opposite of neuroticism.