Extemporaneous \Ex*tem`po*ra"ne*ous\, a. [See {Extempore}.]
Composed, performed, or uttered on the spur of the moment, or
without previous study; unpremeditated; off-hand; ad-lib;
extempore; extemporary; as, an extemporaneous address or
production. -- {Ex*tem`po*ra"ne*ous*ly}, adv. --
{Ex*tem`po*ra"ne*ous*ness},n.
[1913 Webster]