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Synonyms for extemporaneous

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spontaneous, unpremeditated, improvised, extempore, extemporary, impromptu, unprepared, ad-lib*, ad-libbed*, offhand, unstudied, informal, unrehearsed, ad hoc, by ear, on impulse, on the spot, without preparation, off the cuff*, spur-of-the-moment*.

Antonyms prepared*, studied, premeditated. See syn. study at impromptu.impromptu.

See extemporaneous in Webster's New World Roget's A-Z Thesaurus II

adjective

Spoken, performed, or composed with little or no preparation or forethought:

ad-lib, extemporary, extempore, impromptu, improvised, offhand, snap, spur-of-the-moment, unrehearsed. (Informal) off-the-cuff. See prepared

See extemporaneous in American Heritage Dictionary 4 Synonyms

extemporaneous extemporary extempore impromptu offhand unrehearsed unpremeditated ad-lib

These adjectives mean spoken, performed, done, or composed with little or no preparation or forethought. Extemporaneous, extemporary, and extempore most often apply to discourse that is delivered without the assistance of a written text, though it may have been planned in advance: an extemporaneous address; an extemporary lecture; an extempore skit.
Impromptu even more strongly suggests happening on the spur of the moment: an impromptu dinner.
Offhand implies not only spontaneity but also a casual or even cavalier manner: an offhand remark.
What is unrehearsed is said or done without rehearsal or practice though not necessarily without forethought: a few unrehearsed comments.
Unpremeditated implies impulsiveness prompted by strong feeling: asked an unpremeditated question.
Something that is ad-lib is spontaneous and improvised and therefore not part of a prepared script or score: an ad-lib joke.

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