Quick summary: Research linking Dark Triad traits with adult attachment finds that psychopathy relates to both attachment anxiety and avoidance, Machiavellianism to mistrust and lower intimacy expectations, and narcissism to more mixed patterns. These traits can influence how people respond to rejection, conflict and vulnerability without determining whether a relationship becomes secure. Mental health practice and public conversation therefore benefit more from examining observable patterns of reciprocity, responsibility and trust than from applying everyday labels such as narcissist.

Why do some relationships feel emotionally secure, while others become characterised by distance, mistrust, control, or a persistent fear of rejection?

Attachment theory offers one way of understanding these differences. Yet attachment does not operate in isolation. Personality traits (including socially aversive characteristics such as narcissism, Machiavellianism, and psychopathy) may also influence how people experience intimacy, respond to vulnerability, and behave within close relationships.

Collectively known as the Dark Triad, these three traits are often discussed online in highly simplified terms. Words such as “narcissist” have become part of everyday relationship vocabulary, sometimes being used to describe any partner who behaves selfishly or causes emotional distress.

Psychological research presents a more nuanced picture. Narcissism, Machiavellianism, and psychopathy are related but distinct personality constructs. Importantly, research examining Dark Triad traits in general populations concerns personality characteristics that can exist to varying degrees; not simply clinical diagnoses.

Personality and the way we attach

Adult attachment is commonly understood through two dimensions: attachment anxiety and attachment avoidance. People higher in attachment anxiety may be particularly sensitive to rejection or abandonment and seek greater reassurance about the security of their relationships. Those higher in attachment avoidance may experience greater discomfort with emotional dependence and closeness.

Research examining Dark Triad traits and romantic attachment suggests that these personality characteristics can be associated with both attachment anxiety and avoidance, although the patterns differ substantially between individual traits.

This distinction matters. Personality does not determine whether someone will have a healthy or unhealthy relationship. Instead, certain characteristics may influence how people interpret interpersonal situations and respond when they experience rejection, criticism, conflict, or vulnerability.

Psychopathy and emotional insecurity

At the personality-trait level, psychopathy can involve characteristics including interpersonal antagonism, reduced empathy and impulsivity. These characteristics may create difficulties within relationships, particularly when emotional reciprocity and regulation are required.

Research has found associations between psychopathic traits and insecure adult attachment. Other research into romantic relationships has found that different dimensions of psychopathy predict attachment anxiety and avoidance.

This is particularly interesting because emotional detachment and attachment insecurity are not necessarily opposites. Someone may desire interpersonal connection while simultaneously experiencing difficulties with trust, vulnerability or emotional intimacy.

In my own research examining personality and attachment, higher psychopathic traits were associated with both greater attachment anxiety and greater attachment avoidance. While findings of this kind cannot establish that one characteristic causes another, they contribute to a broader picture of how personality may relate to the ways individuals experience closeness.

Machiavellianism and mistrust

Machiavellianism is generally associated with strategic interpersonal behaviour, cynicism, manipulation and distrust. From an attachment perspective, this is particularly relevant because close relationships require some degree of vulnerability.

Intimacy involves trusting another person with emotions, personal information and, at times, dependency. When interpersonal relationships are approached through suspicion or an expectation that others may exploit vulnerability, closeness can become psychologically complicated.

Recent research involving 900 adults in intimate relationships found that Machiavellianism was associated with lower expectations of intimacy, further demonstrating how personality characteristics may shape expectations surrounding emotional closeness.

In my own research, Machiavellian traits were positively associated with attachment anxiety, providing another indication of a potential relationship between these characteristics and interpersonal insecurity.

Narcissism is more complicated than the internet suggests

Perhaps no personality term has entered everyday relationship language as successfully as ‘narcissist’.

Yet narcissism is considerably more complex than its popular portrayal. At the trait level, narcissism may involve characteristics such as grandiosity, entitlement, self-enhancement and a desire for admiration. Different dimensions of narcissism can also relate differently to interpersonal functioning.

Research illustrates this complexity. Studies examining Dark Triad traits and attachment have found that narcissism does not necessarily follow the same pattern as Machiavellianism or psychopathy. For example, research on romantic attachment found that lower narcissism, rather than higher narcissism, predicted greater attachment anxiety in one sample.

My own findings reflected this complexity: narcissism showed a small negative association with attachment avoidance.

This does not mean that narcissistic characteristics are necessarily beneficial for relationships. Rather, it demonstrates why the three Dark Triad traits should not be treated as interchangeable; and why psychological labels should be used cautiously.

Moving beyond psychological labels

Understanding personality can be valuable. Labels become less useful when they replace curiosity about actual behaviour.

Instead of asking only, “Is this person a narcissist?”, it may be more informative to ask: How does this person respond to boundaries? Can they tolerate disagreement? Do they accept responsibility when their behaviour causes harm? Is emotional vulnerability reciprocated? Does the relationship consistently produce fear, instability or mistrust?

These questions focus on observable relationship patterns rather than attempting to diagnose another person from a distance.

Research into personality and attachment can help us understand why individuals differ in their approaches to intimacy, trust, conflict and vulnerability. But human relationships rarely reduce neatly to a single personality trait. Attachment experiences, personality, previous relationships, social environments and the behaviour of both partners may all contribute to the dynamics that develop between two people.

Perhaps one of psychology’s most useful contributions to our understanding of relationships is therefore not providing us with more labels, but helping us ask better questions.

Diana-Irina Iordache holds an MSc in Forensic Psychology from Goldsmiths, University of London. She researches childhood trauma, attachment, personality and rule-breaking behaviour, and how these inform prevention, intervention and rehabilitation.