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When something is undoable, does it mean that it has the ability to be reverted back to its previous state or does it mean that it's not feasible?

I broke something on my computer and a fix is undoable. :(
I broke something on my computer but it's undoable. :)

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Sounds very contrived. Use fix instead. I broke something but it is fixable. I broke something, and it is unfixable. –  mplungjan Mar 1 '11 at 10:13

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up vote 8 down vote accepted

Both, actually. In the sense that something can be reverted to its prior state, the word is formed by joining undo and -able, literally something that is able to be undone. In the sense that something cannot be done, the word is formed by joining un- and doable, literally something that is not doable. While the two etymologies converge at un- + do + -able, the order in which the affixation occurs is the important thing.

Source: Wiktionary and personal experience

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This reminds me of unpublished. –  kiamlaluno Mar 1 '11 at 13:07

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