Probably the best that can be said is that it is easiest to make the case for the INFP, INTP, or ISTP as the most introverted personality type.
Of all of the introvert personality types on the MBTI, the INTP tends to be the most introverted. They tend to be thoughtful, quiet, and very reserved around others.
INTJs are typically very quiet and reserved unless they happen to meet someone who, like them, loves exploring theoretical concepts, analyzing possibilities, and dreaming up long-term goals. That said, they're not typically very verbal when it comes to discussing their feelings or people's personal lives.
INFJ by far. They are the rarest out of all the personalities, and probably for a reason - they make zero sense. Generally speaking, these people are the most social introverts, detail-oriented intuitives, flexible judgers and objective feelers.
The Provider: ESFJ
People with the ESFJ personality type are the stereotypical extroverts. They are social butterflies, and their need to interact with others and make people happy usually ends up making them popular.
INTP stands for Introverted, Intuitive, Thinking, and Perceiving, and this personality type is the most introverted of the Introvert Club.
The least common Myers-Briggs personality Type is INFJ
People who prefer INFJ make up only 1.5% of the general population in the US.
Introverts claim to dread it, intuitives admit they abhor it, thinkers find it pointless, and perceivers believe it's excessive. In fact, the more we analyze the concept of small talk, the more it seems that most people inherently dislike it.
The INFP. One of the most imaginative of the types, INFPs hold a childlike wonder for the world beyond the senses.
"ESFJs are social creatures with a lot of love for routine. They tend to be sensitive and feel most awkward when they think they are the butt of someone's joke or are not having their feelings in a friendship or relationship reciprocated," says Owens.
INFJs may seem shy at first, but they usually have a lot going on beneath the surface. They tend to follow their hunches to determine what to do next. However, they'll usually share their vision for the future only with the people they're closest to.
INTJ – (Introvert, Intuitive, Thinking, and Judging). The Mastermind. Other nicknames for the INTJ include The Conceptual Planner or The Architect. Arguably the smartest MBTI type.
ENFJs are known for searching for the goodness in others, and for being able to summon a powerful level of compassion, which means that even when their partner falls short, their acceptance and love is still unwavering. Expressive, nurturing, and supportive, ENFJs love hard because it's the only way they know how.
In INTPs and ISTPs, Introverted Thinking is the dominant function. They are the personality types that exhibit the strongest traits of Introverted Thinkers. Both INTP and ISTP individuals are observant and analytical. They approach their environment with curiosity, paying attention to the smallest details.
According to the MBTI® Manual ENTJs are the type least likely to suppress anger and least likely to show anger.
Statistically speaking, Assertive Virtuosos (ISTP-As), Architects (INTJ-As), and Logisticians (ISTJ-As) are the least likely to seek affection from everyone, while Turbulent Campaigners (ENFP-Ts) and Entertainers (ESFP-Ts) are the most likely.
The ISFJ and Self-Acceptance
ISFJs ranked as having low self-acceptance according to the CPI™ tool. This may be largely because ISFJs are known for being cautious and careful, which may come across as self-doubting at times.
The ENFP. You'll never give up because you nearly always see alternatives, possibilities, and potential in the world.
Of all the personality types, ENTJs are arguably the ones who care least about other people's opinions of them.
Which Types Ranked as the Least Happy? Sadly, INFPs ranked the lowest for happiness as well as the lowest for life-satisfaction. According to the third edition of the MBTI® Manual, these types also ranked second highest in dissatisfaction with their marriages and intimate relationships.
Idealist (INFP)
INFPs are quiet and prefer not to talk about themselves. They enjoy spending time alone in quiet places.
ISTPs are the least intense personality type. They are cool, calm, and collected individuals. They are not likely to get wrapped up in their own thoughts and emotions or dwell on things that have happened in the past. ISTPs prefer to focus on what is happening right now and on practical matters.
An introvert is a person with qualities of a personality type known as introversion, which means that they feel more comfortable focusing on their inner thoughts and ideas, rather than what's happening externally. They enjoy spending time with just one or two people, rather than large groups or crowds.