copy and pasted from icd 11
The core feature of the Detachment trait domain is the tendency to maintain interpersonal distance (social detachment) and emotional distance (emotional detachment). Common manifestations of Detachment, not all of which may be present in a given individual at a given time, include the following:
Social detachment. Social detachment is characterized by avoidance of social interactions, lack of friendships, and avoidance of intimacy. Individuals high on Detachment do not enjoy social interactions and avoid all kinds of social contact and social situations to the extent possible. They engage in little to no ‘small talk’ even if initiated by others (e.g., at store check-out counters), seek out employment that does not involve interactions with others, and even refuse promotions if these would entail more interaction with others. They have few to no friends or even casual acquaintances. Their interactions with family members tend to be minimal and superficial. They rarely, if ever, engage in any intimate relationships and are not particularly interested in sexual relations.
Emotional detachment. Emotional detachment is characterized by reserve, aloofness, and limited emotional expression and experience. Individuals high on Detachment keep to themselves to the extent possible, even in obligatory social situations. They are typically aloof and respond to direct attempts at social engagement only briefly and in ways that discourage further conversation. Emotional detachment also encompasses emotional inexpressiveness, both verbally and non-verbally. Individuals high on Detachment do not talk about their feelings and it is difficult to discern what they might be feeling from their behaviours. In extreme cases, there is a lack of emotional experience itself and they are non-reactive to either negative or positive events, with a limited capacity for enjoyment.