We promise not to ramble on endlessly about the origins of interminable. The word was borrowed into English in the 15th century and descends from a Latin combination of the prefix in- ("not") and the verb terminare, meaning "to terminate" or "to limit." The word describes not only something without an actual end (or no end in sight, such as "interminable oceans"), but also events, such as tedious lectures, that drag on in such a way that they give no clear indication of ever wrapping up. Other relatives of interminable in English include terminate, determine, terminal, and exterminate.