impromptu

definition: without advance preparation

example:

speech part: adverb

synonyms: ad lib

definition: with little or no preparation or forethought

example:

speech part: adjective

synonyms: offhand offhanded extempore ad-lib extemporaneous extemporary off-the-cuff unrehearsed

definition: an extemporaneous speech or remark

example: a witty impromptu must not sound premeditated

speech part: noun

synonyms:

definition: a short musical passage that seems to have been made spontaneously without advance preparation

example:

speech part: noun

synonyms:

impromptu is explained and pronounced