The over-confidence is always subtle. Instead of indulging in explicit arrogant behavior and name calling, they use subtle passive aggressiveness to express their feelings!
On the other end of the spectrum, we have those suffering from perpetual imposter syndrome! They think that they are a nobody and good for nothing while hiding and suppressing all the creativity and knowledge within their subconscious. The imposter syndrome won't let them have even the slightest of confidence, and that leads to inaction. This loss is both theirs and humanity's.
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