Synonyms of the word

extemporary

• adj. Extemporaneous.

ad-lib

• v. To improvise all or part of a speech or other performance, especially in comedy.

extemporaneous

• adj. without preparation or advanced thought; offhand.

extempore

• adj. carried out with no preparation; impromptu.
• adv. without preparation; extemporaneously.
• n. Something improvised.

impromptu

• adj. Improvised; without prior preparation, planning or rehearsal; extemporaneous; unplanned.
• n. (music) a short musical composition for an informal occasion often with the character of improvisation…
• n. any composition, musical or otherwise, that is created on the spot without preparation.

off-the-cuff

• adj. (idiomatic) Extemporaneous; without prior preparation; spontaneous; impromptu.

offhand

• adj. without planning or thinking ahead.
• adj. careless; without sufficient thought or consideration.
• adj. curt, abrupt, unfriendly.
• adv. right away, immediately, without thinking about it.
• adv. in an offhand manner.

offhanded

• adj. in a casual or curt style, without preparation or thought; Impromptu, offhand.

unprepared

• adj. Not prepared; caught by surprise.
• n. A black mark given to a pupil who arrives at a lesson without the necessary items or preparation.

unrehearsed

• adj. Not rehearsed.