Longman Dictionary of Contemporary English
Douglas Harper's Etymology Dictionary
Wiktionary
a. not workable or operable; not practical; unmanageable
WordNet
adj. not capable of being carried out or put into practice; "refloating the sunken ship proved impracticable because of its fragility"; "a suggested reform that was unfeasible in the prevailing circumstances" [syn: impracticable, infeasible, unfeasible]
Usage examples of "unworkable".
I judged them to be misconceived in theory and unworkable in practice.
The American colonies were initially as jealous of their autonomy as the Cherokee chiefdoms, and their first attempt at amalgamation under the Articles of Confederation (1781) proved unworkable because it reserved too much autonomy to the ex-colonies.
We can set up equations delimiting various conceivable approaches to the rescue problem, and crank 'em through the computator, and eliminate unworkable ideas.
After a few moments, Eisenhower brought up the concept of executive privilege but quickly rejected it as unworkable.
As suspicion spreads that top-down controls are unworkable, plannees begin clamoring for the right to participate in the decision-making.
It would have shredded her ego if de Wynter had been able to think of a workable solution when she hadn't been able to come up with even an unworkable one.
Spencer fed himself on complex, unworkable economic theories, and he would jaw you half to death about bimetallism, or Social Credit, if you gave him a chance.