English is a trickster of a language, evidenced by the fact that two words that appear to be antonyms can actually mean the exact same thing. For the most part we manage to bumble along without confusing the two, and can figure out which meaning is intended based on context (although in the case of regardless and irregardless some extra time is needed for teeth-gnashing). We know thatinhabitable refers to a place that is habitable, and don’t feel any need to stop our conversation to point out the superfluous in- prefix.
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