ISTJ friends may not be the most affectionate or talkative, but they will definitely be very loyal and trustworthy. People with this personality type tend to approach everything slowly and methodically – and this includes their friendships as well. An ISTJ may be slow to make a promise, but once they take that step, they will do everything they can to meet their commitments. Honor and loyalty are very important to ISTJs, especially where close friends are concerned.
ISTJ personalities are also likely to be quite sensitive among close friends, even though they may find it difficult to show affection. ISTJs prefer to convey such feelings through their efforts rather than words. That being said, ISTJs do not mind relaxing and having fun with joyful and talkative extrovert friends, unlike many other introvert types. The ISTJ’s patience is not unlimited, but they are definitely able to stop being serious every once in a while.
ISTJs usually seek friends who share similar principles and opinions. Consequently, they tend to drift towards other SJ personalities as these types are most likely to have a similar vision of the world. ISTJs are not close-minded, and they can certainly understand and appreciate the strengths of other personality types – however, they will rarely become close friends as ISTJ personalities are unlikely to be willing to expend the amount of energy required to bridge the differences. Surprisingly, ISTJs tend to form strong friendships with N types, even though the S-N barrier may sometimes be too difficult to cross.