extemporaneous
[adjective]
Synonyms: autoschediastic, extemporary, extempore, impromptu, improvised, offhand, spur-of-the-moment, unrehearsed, unstudied

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Contrasted words: designed, planned, prepared, projected, schemed, thought-out, considered, deliberated, premeditated, studied
Related Idioms: off the cuff, on the spur of the moment
Related Words: casual, informal, unprepared, unthought-out, impulsive, snap, spontaneous

[TahlilGaran] English Synonym Dictionary ▲

ex‧tem‧po‧ra‧ne‧ous /ɪkˌstempəˈreɪniəs◂/ adjective formal
[Date: 1600-1700; Language: Late Latin; Origin: extemporaneus, from Latin ex tempore; ⇒ extempore]
spoken or done without any preparation or practice Synonym : impromptu:
an extemporaneous speech
—extemporaneously adverb

[TahlilGaran] Dictionary of Contemporary English ▲