improvisate

Im*prov"i*sate, a. Etym: [See Improvise.] Defn: Unpremeditated; impromptu; extempore. [R.] Im*prov"i*sate, v. t. & i. [imp. & p. p. Improvisated; p. pr. & vb. n. Improvisating.] Defn: To improvise; to extemporize.

---