Antonyms of impromptu from BoostVocab

impromptu

/ɪm'prɑmptu/

adjective
with little or no preparation or forethought
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"an impromptu speech"

Similar:

ad-lib extemporaneous extemporary extempore off-the-cuff offhand offhanded unrehearsed unprepared
adverb
without advance preparation
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Similar:

ad lib ad libitum spontaneously
noun
an extemporaneous speech or remark
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"a witty impromptu must not sound premeditated"

type of:
address speech
noun
a short musical passage that seems to have been made spontaneously without advance preparation
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type of:
musical passage passage

Antonyms of impromptu

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