is the state wherein it is not realized by the population at large that the person affected is completely and utterly mad.
This state has many advantages. One is that nothing needs to make sense. This particular advantage is shared with the state NoisilyInsane, but QuietlyInsane is to be preferred because it is less likely to have adverse side-effects.
It is suspected, although not proven, that many residents of EastDorm are in the state of QuietlyInsane.
It is also well known that many residents of EastDorm are QuietlyInane?, while still others are Not-so-QuietlyInane?.