Not all Narcissists are bombastic and in-your-face.
When it comes to narcissists, it is believed they come in 2 flavors: the grandiose and the covert. Narcissists of the grandiose variety are much easier to spot as they exhibit the overtly vane, exploitative, self-entitled, and aggressive behavior commonly associated with narcissism. The covert or vulnerable narcissist on the other hand, is less conspicuous. They are outwardly self-inhibited and modest, and may appear empathetic but inside harbor much of the same grandiose and over-inflated self-image found in their grandiose counterpart.
Covert narcissists are more likely to report themselves as introverted and sensitive. The defensiveness, anxiety and vulnerability of the covert narcissist are traits standardly associated with introversion. While the grandiose narcissist will assert their sense of superiority in blunt and intrusive ways, the closet narcissist will merely hint at it. Here are a list of signs to look for to determine if you or someone you know know is an introverted narcissist.
Source: 7 Signs of a Covert Introvert Narcissist | Psychology Today
Source:23 Signs You’re Secretly a Narcissist Masquerading as a Sensitive Introvert
Source:Two Subtypes of Narcissistic Personality DisorderSource:Interpersonal Analysis of Grandiose and Vulnerable Narcissism”. Journal of Personality Disorders
Source: Two Faces of Narcisssism