flaky: adj. (var sp. `flakey') Subject to frequent lossage.
This use is of course related to the common slang use of the word to
describe a person as eccentric, crazy, or just unreliable. A system
that is flaky is working, sort of -- enough that you are tempted to
try to use it -- but fails frequently enough that the odds in favor
of finishing what you start are low. Commonwealth hackish prefers
dodgy or wonky.