extemporaneous

Ex*tem`po*ra"ne*ous, a. Etym: [See Extempore.] Defn: Composed, performed, or uttered on the spur of the moment, or without previous study; unpremeditated; off-hand; extempore; extemporary; as, an extemporaneous address or production. -- Ex*tem`po*ra"ne*ous*ly, adv. -- Ex*tem`po*ra"ne*ous*ness,n.

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