/ ˈwɜːkəbl; NAmE ˈwɜːrk-/ adjective
1.
( of a system, an idea, etc. ) that can be used successfully and effectively
SYN practical :
a workable plan
2.
that you can shape, spread, dig, etc. :
Add more water until the dough is workable.
3.
( of a mine, etc. ) that can still be used and will make a profit