Ranked by relevance and common usage.
Keep "unfail" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "unfail" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "unfail", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "unfail" or choose a simpler alternative from the closest-match group.
4 total sentences available.
Once an input stream has failed, it is very hard to "unfail" it. You can clear the failbit and take your chances, but that is pretty useless in practice. If you cannot tolerate failure, read the input file as a sequence of strings and then parse the strings.
Source: wiktionary
[…] the problem with HUD running the Housing Authority has to be addressed, because you can't expect the agency that has failed, to unfail.
Source: wiktionary
So-called failed states were perceived as breeding grounds for transnational violence, so great powers began to compete for the right to "unfail" them, to make or re-make their regimes to eliminate security contagion.
Source: wiktionary
Trying to Unfail the Homeless Individual – Wibke Schniedermann.
Source: wiktionary
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.