I'm re-reading the novel Foundation by Isaac Asimov and just came by the word asperity. It's a noun that means harshness of tone or manner or harsh qualities or conditions.
MORE: ˌInterregnum, a period when normal government is suspended, especially between successive reigns or regimes.
the period in English history from the execution of Charles I in 1649 to the Restoration of Charles II in 1660.
an interval or pause between two periods of office or other things.
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