Serious MBTI Personality Type

Personality

What personality type is Serious? Serious is an ISTJ personality type in MBTI, 1w9 - sp/sx - 163 in Enneagram, RLOEN in Big 5, LSI in Socionics.

I have a theory why ISTJs tends to be serious: https://www.youtube.com/watch?v=Llo_Iqzqt9o

Biography

A serious person is quiet, thinks carefully about things, and does not laugh a lot.

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