じしん
self-confidence
He believes what he himself says, and it is all over his face before he has opened his mouth. The same じしん as 自身 the self, except that this one is what the self thinks of itself: じしん.
Same reading as 自身, self. 自身 is the plain fact of you, and 自信 has 信 believe in it, so it is what you reckon of yourself.
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