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The Collaborative International Dictionary
Imprompt

Imprompt \Im*prompt"\, a. Not ready. [R.]
--Sterne.

Douglas Harper's Etymology Dictionary
imprompt

(obsolete) 1759, from Latin impromptus "unready, hesitating," from assimilated form of in- "not, opposite of" (see in- (1)) + promptus "ready" (see prompt).

Wiktionary
imprompt

a. 1 Not prompt; delayed. 2 (context obsolete English) Not ready.