Conceited is to humble as jubilant is to discouraged.
<span />
The category that this falls under is personal skills. Thoroughness and close attention to detail is more of a personal skill that you're sort of born with, whereas how well you can hit a baseball is an acquired skill.
It is used in several contexts, one of them is "stark naked", when it is used like "naked as a jaybird", or in this case, when someone needs to take a shower, or change their clothes because she or he is scruffy, dirty or smelly, You may hear "go change your clothes, you are ragged as a jaybird", the color of the bird gives an appearance of dirt that is related to the popular saying.
He thinks he is so powerful he can make people vanish