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impromptu (adj) without preparation or plan.
An impromptu speech is a speech delivered on the spur of the moment without any preparation. Impromptu verses are verses composed on the spot and recited without any preparation. So is an impromptu party a party held without preparation or planning.
- Lucy’s impromptu recitation of poetry had every one by surprise. They did not know she was capable of composing poetry on the spur of the moment.
- Roger’s speech was really wonderful. Every one thought it must have taken days for him to prepare the speech, but he insisted that it was an impromptu speech delivered off hand.