Unsustainable

[Vania]

The sound a robot would create with a guitar if [the robot] was built [by God] under [Matt Bellamys] close supervision.

[Julian]

A political policy or program that sounds too good to be true because the money to [fund it] either does not exist or [very shortly] will not exist. The politician advocating such a program is shielded from this reality by the fact that he or she will be out of office and on the lecture circuit by the time the general public realizes that they have been [hoodwinked].

[Monty]

uhn-suh-stey-nuh-buh l
not [sustainable]; [not to be] supported, maintained, upheld, or corroborated.

[Couch Potatoe]

Not able to be maintained at the current rate or level.

[Agnes]

Something that is unsustainable cannot continue at the same rate: