Under extreme stress, fatigue or illness, the INFJ's shadow may appear - a negative form of ESTP. Example characteristics are:
acting very impulsively, making decisions without thinking them through
doing things to excess - e.g.: eating, drinking or exercising
being critical of others, and finding fault with almost everything
being preoccupied about unimportant details and doing things that have no meaning
acting in a very materialistic and selfish way
cutting corners, breaking the rules, and even contradicting the INFJ's own values
The shadow is part of the unconscious that is often visible to others, onto whom the shadow is projected. The INFJ may therefore readily see these faults in others without recognising it in him/her self.