Kenglish: Pretension
Pretension is a great way to lose respect of your peers. As my friend Brad has commented:
“If he were only half as good as he thinks he is, he would be a great developer.”
Brad likes to emphasize the idea of negative ability: that quality that allows one to say “I don't know”. You can never reach your potential if you think you know it all and are always right.
This discussion relates to this issue. As does this study summarized here.
Synonym: Incompetence