Extemporaneous
Pronunciation : Ex*tem`po*ra"ne*ous
Part of Speech : a.
Etymology : [See Extempore.]
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913