I did a Google:define on
Promptus and think it has Latin origin. But since I don't see it in the English dictionaries, I am not sure if I can use it at all in my conversation.
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There is a Latin word promptus, from which we get prompt.
Burton's Legal Thesaurus glosses it as "expeditious, prompt, ready (prepared)".
So, while it's Latin, it has been used in English, in legal contexts at least.