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Why do we say undeletable instead of indeletable. Sometimes with other words we use an in prefix, such as with indefatigable.

I'm curious about un vs in.

  • You make it sound like we don't use "un-" ever... "unmentionable" means "unable to be mentioned"... why do you think "in" is better? Also... we do actually use a form of "in-" with delete - indelible – Catija Jun 16 '16 at 21:22
  • I'm not entirely sure. I'll edit the question to remove any suggestion that 'un' isn't ever used – danwellman Jun 16 '16 at 21:26
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    I suggest caution in using "undeletable" because, thanks to computers, there is a verb "undelete". As a result, "undeletable" seems to have not only its traditional meaning, "unable to be deleted", but also the meaning "able to be undeleted". – Andreas Blass Jun 16 '16 at 23:22
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    The proper word is indelible. The word undeletable is computerese, and should only be used in the context of computers. And, as @Andreas comments, it's ambiguous in that context. – Peter Shor Jun 17 '16 at 2:49
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    Possible duplicate of Why "unequal" but "inequality"? – MetaEd Jun 27 '16 at 19:13
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An article on Mental Floss discusses and explains this: http://mentalfloss.com/article/57840/whats-difference-between-and-un

To sum it up, there is no fixed rule between using "un-" and "in-". The former usually works on words with Germanic roots, and the latter works on words with Latin roots. Making this distinction is not mandatory, but it seems to be the case.

In most cases, one prefix will be more suitable than the other. This is determined by what either prefix adds to the word: connotation, pronunciation, e.t.c. "Infinite" is a common word whereas "unfinite" is never used, though the prefixes have the same meaning. "Intouchable" is never used, whereas "untouchable" is.

Again, there is only a fine line between the two. Unfortunately, it can be extremely bothersome to differentiate. My advice is to use whichever conveys your thoughts better, and does not sound odd.

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