This could be dysfunctional, disadvantageous, disposable, dispensable, defunct, discarded, doomed, dead.
sleep
There are none. However, "ax" can be considered a synonym of sword, and the second letter is an x. There is also "excalibur."
move
recover
Haughty is another word for arrogant that begins with the letter H.
Another word for registered voters that begins with the letter C is constituents.
Unusual is another word for interesting.
annoying
atrocious
A four letter word for poverty is need.
Isle
eager
ligament
neat
Exert.
one is advocateannounce