inexplicable
/ˌɪn.ɪkˈsplɪ.kə.bl̩/ noun C2- Something that is impossible to explain.
Plural inexplicables
From the library
It is really the most extraordinary and inexplicable business.’
It was in the spring of the year 1894 that all London was interested, and the fashionable world dismayed, by the murder of the Honourable Ronald Adair under most unusual and inexplicable circumstances.
This was the telegram which you appear in some inexplicable way to have seen.
It is, as I gather from your original remarks, an inexplicable, or at least an unexplained, murder.
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