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What is the difference between unexplainable and inexplicable? Are they exact synonyms or are there situations where one is preferred over the other?

Is unexplainable a clumsy modern variant (perhaps only existing due to uneducated usage) or an old word that's fallen out of fashion?

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2 Answers 2

up vote 5 down vote accepted

Google N-gram Viewer suggests that unexplainable is a recent invention (at least in written form):

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way to pull out the n-gram viewer! –  Rikon Sep 29 '11 at 12:59
An NGram of "he inexplicably [did sth]" against unexplainably, shows we simply don't use that second form. Curious, really, given that explain is far more common than explicate overall. –  FumbleFingers Sep 29 '11 at 15:18

The OED gives the meaning of 'unexplainable' as 'inexplicable'. The oldest citation is dated early eighteenth century, so it's not particularly new and the three citations provided don't suggest it's an uneducated usage.

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